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Version 3.7  October 16, 1981

	It is now possible to split lines with substitute commands from vi,

	by using ^V<return> in the rhs.  This takes care of the last

	good reason for using ex command mode.

	Mode lines are now supported.  Put a line containing

		ex: xxx :

	in the first or last 5 lines of the file, where xxx is any ex

	command you want executed when that file is read in.  To make

	other programs happy, it should probably be inside a comment.

	You can use vi: as well as ex:.  (Note: no space allowed

	between the "ex" and ":".  The spaces around xxx are considered

	part of the command, and so are optional.)

	If there is a file .exrc in the current directory, it will be

	sourced when you enter vi, after your EXINIT or ~/.exrc.

	The changeable scrolling region of the vt100 is now used in

	place of insert line, resulting in much better performance.

	Vi uses the new AL, DL, LE, RI, DO, and UP (all upper case)

	termcap capabilities, which are parameterized versions of their

	lower case equivalents.  This will results in better performance

	on ANSI terminals, and especially on the Tektronix 4025 which

	has parameterized local motions but cannot cursor address.

	Vi uses backtabs again.  Now it knows how to handle backtabs on

	terminals that have tabs set at intervals other than 8, and it

	won't use backtabs if gtty indicates it can't use tabs.

	A bug causing <escape> <del> to core dump vi has been fixed.

	A bug causing writes to filters when editing encrypted files

	to write encrypted text has been fixed.

	A bug causing the message "substitution loop", when you enter a

	1,$s/xxx/yyy/g with lots of changes, has been fixed.

	A bug causing the current directory to be chmodded to 0 if you

	set nomesg after starting up the editor has been fixed.  Note

	that the nomesg option is intended for your EXINIT, since it only

	takes effect on entry to the editor.

	The eat newline glitch has been fixed so that vt100's and tab132's

	handle long lines correctly.

	Some internal changes have been made so that vi can run under UNIX

	on the Bell Labs 3B machine, the BBN C/70, and the IBM 370.

Version 3.6  October 30, 1980

	A kernel problem on the V7 pdp-11 overlay systems which causes

	bad EMT traps to happen randomly, core dumping the editor,

	has been programmed around by catching EMT traps.

	A bug which prevented using a screen larger than 48 lines has

	been fixed.

	A bug which allowed you to set window to a value larger than

	your screen size has been fixed.

	The screen size limit on non-VM/Unix systems has been increased

	to 66 lines or 5000 characters, to allow the Ann Arbor Ambassador

	terminal to be used.

	A bug which caused hangups to be ignored on USG systems has

	been fixed.

	A bug which caused maps with multiple changes on multiple lines

	to mess up has been fixed.

	If you get I/O errors, the file is considered "not edited" so

	that you don't accidently clobber the good file with a munged

	up buffer.

	An inefficiency in 3.5 which caused the editor to always call

	ttyname has been fixed.

	A bug which prevented the "source" command from working in an

	EXINIT or from visual has been fixed.

	A bug which caused readonly to be cleared when reading from

	a writable file with "r" has been fixed.

	The name "suspend" has been made an alias for "stop".

	The stop command now once again works correctly from command mode.

	On a dumb terminal at 1200 baud, "slowopen" is now the default.

	A bug in the shell script "makeoptions" which searched for a

	string that appeared earlier in a comment has been fixed.

	A bug that caused an infinite loop when you did ":s/\</&/g"

	has been fixed.

	A bug that caused & with no previous substitution to give

	"re internal error" has been fixed.

	A bug in the binary search algorithm for tags which sometimes

	prevented the last tag in the file from being found has been fixed.

	Error messages from expreserve no longer output a linefeed,

	messing up the screen.

	The message from expreserve telling you a buffer was saved when

	your phone was hung up has be amended to say the editor was

	terminated, since a kill can also produce that message.

	The "directory" option, which has been broken for over

	a year, has been fixed.

	The "r" command no longer invokes input mode macros.

	A bug which caused strangeness if you set wrapmargin to 1

	and typed a line containing a backslash in column 80 has

	been fixed.

	A bug which caused the "r<cr>" at the wrapmargin column

	to mess up has been fixed.

	On terminals with both scroll reverse and insert line,

	the least expensive of the two will be used to scroll up.

	This is usually scroll reverse, which is much less annoying

	than insert line on terminals such as the mime I and mime 2a.

	A bug which caused vi to estimate the cost of cursor motion

	without taking into account padding has been fixed.

	The failure of the editor to check counts on ^F and ^B commands

	has been fixed.

	The "remap" option failed completely if it was turned off.

	This has been fixed.

	A check of the wrong limit on a buffer for the right hand side

	of substitutions has been fixed.  Overflowing this buffer could

	produce a core dump.

	A bug causing the editor to go into insert mode if you typed

	return during an R command has been fixed.

	A bug preventing the + command from working when you edit a

	new file has been fixed by making it no longer an error to

	edit a new file (when you first enter the editor.)  Instead

	you are told it is a new file.

	If an error happens when you are writing out a file, such as

	an interrupt, you are warned that the file is incomplete.

Version 3.5 -- August 20, 1980

	The provisions for changing the window size with a numeric

	prefix argument to certain visual commands have been deleted.

	The correct way to change the window size is to use the z

	command, for example z5<cr> to change the window to 5 lines.

	The code to handle the -x (encryption) option has been made

	conditionally compiled, so that ex can run on an an 11/34 (!)

	with overlays.  Since this code calls getpass, stdio was

	being pulled in even without VMUNIX being defined.  The

	savings from not defining CRYPT are about 4K of text and 4.5K

	of bss.

	Bill Joy put in a buffering scheme under the VMUNIX flag so

	that up to 64K of file is edited in-core until you make enough

	changes to force a temp file sync.  This makes entry into the

	editor much faster, but also makes vi much bigger.

	The source to ex is now sccs'ed.

	An undocumented "feature" which caused the ^^ command to return

	to the previous tag, if in the current file, instead of the

	previous file, has been removed.

	A bug which prevented ex from compiling on systems with the new

	tty driver but no process control (such as Cory) was fixed.

Version 3.4 -- June 24, 1980

	The visual page motion commands ^F and ^B now treat any preceding

	counts as number of pages to move, instead of changes to the

	window size.  That is, 2^F moves forward 2 pages.

	A :vi <file> command from visual mode is now treated the same

	as a :edit <file> or :ex <file> command.  The meaning of the

	vi command from ex command mode is not affected.

	Provisions to handle the new process stopping features of the

	Berkeley TTY driver have been added.  A new command, "stop",

	takes you out of the editor cleanly and efficiently, returning

	you to the shell.  Resuming the editor puts you back in command

	or visual mode, as appropriate.  If autowrite is set and there

	are outstanding changes, a write is done first unless you say

	"stop!".  From visual mode, the command ^Z is the same as :stop.

	Note that if you have an arrow key that sends ^Z the stop function

	will take priority over the arrow function.  If you have your

	"susp" character set to something besides ^Z, that key will be

	honored as well.

	A read only mode now lets you guarantee you won't clobber your

	file by accident.  You can set the on/off option "readonly" (ro)

	and writes will fail unless you use an ! after the write.

	Commands such as x, ZZ, and autowrite, and in general anything

	that writes is affected.  This option is turned on if you invoke

	ex with the -R flag.  A new link called "view" has been  created.

	View is just like vi but it sets readonly.

	The encryption code from the v7 editor is now part of ex.

	You invoke ex with the -x option and it will ask for a key,

	as ed.  The ed "x" command (to enter encryption mode from

	within the editor) is not available.

	The editor now adopts the convention that a null string in the

	environment is the same as not being set.  This applies to

	TERM, TERMCAP, and EXINIT.

	A word abbreviation mode is now available.  You can define

	abbreviations with the abbreviate command

		:abbr foo find outer otter

	which maps "foo" to "find outer otter".  Abbreviations can be

	turned off with the "unabbreviate" command.  The syntax of these

	commands is identical to the map and unmap commands, except

	that the ! forms do not exist.  Abbreviations are considered

	when in visual input mode only, and only affect whole words

	typed in, using the conservative definition.  (Thus "foobar"

	will not be mapped as it would using map!)

	Abbreviate and unabbreviate can be abbreviated to "ab" and

	"una", respectively.

	The editor now supports certain terminals that use strings other

	then \r and \n for return and linefeed by implementing the cr

	and nl termcap options.  (Thanks to UCLA for these enhancements).

	The termcap attribute ns is now checked for, and ex refuses to

	go into visual mode on such a terminal unless it has sf.

	Terminals that can cursor address but cannot go up a line

	now work in visual.

	If you change your start and stop characters to something other

	than the default ^S and ^Q, vi now turns them off.  This causes

	people who change them to escape not to lose so badly.

	The quit character is once again turned off so that datamedias

	which send ^\ for the right arrow key work.

	The ~ command now repeats correctly with ".".

	If you type in an unmatched ) or } in showmatch mode, the editor

	will now beep to warn you about your mistake.  The ) or } is

	still accepted.

	The way macros are undone has been improved considerably.

	The number of changes inside the macro is counted, and just

	before the second change the state before the macro is recreated

	internally and saved to allow the macro to be undoable as a unit.

	Hence, if the macro makes only one change the particular change is

	undone (which will probably not redraw the screen).  If no changes

	are made (for example, the arrow keys) the previous thing that could

	be undone is not clobbered.

	The undomacro option has been deleted since it is no longer needed.

	Editor scripts can now contain comments.  Begin the comments with "

	(double quote).  Comments can be on their own line or come at the

	end of command lines.  The comment continues to the end of the line.

	The 3rd version of the USG tty driver is now supported, making it

	possible on USG systems to interrupt redrawing the screen and to

	not flush output when interruptable commands take place.

	The rewind command has been added to the list of commands that

	the autowrite option knows about.

	The wrapmargin option is now usable.  The way it works has been

	completely revamped.  Now if you go past the margin (even in the

	middle of a word) the entire word is erased and rewritten on the

	next line.  This changes the semantics of the number given to

	wrapmargin.  0 still means off.  Any other number is still a

	distance from the right edge of the screen, but this location

	is now the right edge of the area where wraps can take place,

	instead of the left edge.  Wrapmargin now behaves much like

	fill/nojustify mode in nroff.

	A bug on the USG system where hanging up the phone causes more

	than one SIGHUP to be sent has been compensated for.

	A bug which caused the :sh command not to send the vs and ti

	sequences when you returned has been fixed.

	A bug which caused a file that bombed out in the middle of

	an edit command to be considered modified has been fixed.

	A bug which caused the screen to be wrong after undoing a

	:move command has been fixed.

	A bug which messed up the buffer and the screen after

	undoing a :join command has been fixed.

	The source file ex_io.c has been split into ex_io.c and

	ex_unix.c to avoid a problem where many C compilers overflowed

	the symbol table.

	A bug which prevented turning off your prompt in your .exrc

	has been fixed.

	Some of the code internal to the editor has been rearranged

	and some comments added.

	The bug fix to the USG tty driver to output a null character

	as padding at 1200 baud has been improved to output a DEL

	at 1200 baud or above.

	Terminals with small screens (less than 20 columns or less

	than 5 lines) should now work.

	A bug which prevented you from entering the character DEL

	into the buffer if you changed your interrupt character to

	something else besides DEL has been fixed.

	A bug which caused the current line to be clobbered when

	you did a /, ?, or : command which mapped an input macro

	successfully has been fixed.

	If you map o to O and O to o and have remap set, the editor

	now catches the infinite loop.

	A put command after a macro now beeps instead of putting

	a copy of the whole buffer.  (Note that the arrow keys

	on terminals are considered macros.)

	A bug which caused things like d) and d} to miss the last

	character when they should have deleted to the end of the

	buffer has been fixed.

	A bug which caused the last character to be lost when you

	read in a file with no newline at the end of the last line

	has been fixed.

	A bug that caused garbage to be in the buffer if the temp file

	overflowed has been fixed.  (This only affected non-VMUNIX systems

	since the temp file cannot overflow on VMUNIX.)

	When a macro or global is undone, you no longer get picked up and

	dropped on line 1.

	The character | can now be escaped with \| in file names.

	A bug which prevented the confirm option to a substitution that

	was inside a source command has been fixed.

	A bug which caused the editor to not work if the tab stop size

	did not divide the screen width has been fixed.

	A bug on HP terminals that caused the screen to be messed up if

	you scrolled up something that began the same way as the echo line

	has been fixed.

	A macro bug which sometimes caused the next character after an

	escape to be ignored on an HP terminal has been fixed.

	A bug which caused unmap of strings with length 2 to fail has been

	fixed.

	A bug which left vi confused if you invoked a macro containing a

	quit to command mode and then did an undo has been fixed.

	An old ed bug which caused globals to fail when they did a substitute

	on the next line has been fixed.

	The % operator will now find matching square brackets the same way

	it does parentheses and braces.  It will not display them in

	showmatch mode, however, and will not use a ] to match all ('s.

	Code has been added to handle the Beehive Superbee terminal,

	using f1 for escape and f2 for control C.

	The default value of the option shell is now taken from the

	environment variable SHELL, if present.

Version 3.3 -- February 2, 1980

	The default window sizes have been changed.  At 300 baud the

	window is now 8 lines (was 1/2 the screen size).  At 1200 baud

	the window is now 16 lines (was 2/3 the screen size, which was

	usually also 16 for a typical 24 line CRT).  At 9600 baud the

	window is still the full screen size.  Any baud rate less than

	1200 behaves like 300, any over 1200 like 9600.

	A new command mode command "x" (for "xit") has been added.  This

	is the same as wq but will not bother to write if there have been

	no changes to the file.  The command letter was chosen for

	convenience and compatibilty with hed.

	The command "ZZ" from vi is the same as ":x<cr>".  This is

	the recommended way to leave the editor.  Z must be typed twice

	since this is two easy to type by accident and has such severe

	effects if unintentional.

	The options w300, w1200, and w9600 can be set.  They are synonyms

	for "window", but only apply at 300, 1200, or 9600 baud, resp.

	Thus you can specify you want a 12 line window at 300 baud and

	a 23 line window at 1200 baud with

		:set w300=12 w1200=23

	It is now possible to say

		:set window=5

	and get the effect the next time the screen is redrawn from scratch.

	(^L and Hit return to continue don't start from scratch.)

	This is sort of pointless, since both

		5:<cr>

	and

		z5<cr>

	do the same thing with better results.

	The editor no longer uses nondestructive space, except when in

	insert mode.  It instead prints the character it would be

	moving over.  This is a real win on terminals that use an

	escape sequence to nd space.

	It is now possible from visual to string several search expressions

	together separated by semicolons the same as command mode.  For

	example, you can say

		/foo/;/bar

	from visual and it will move to the first "bar" after the next "foo".

	This also works within one line.

	The option "mapinput" is dead.  It has been replaced by a much

	more powerful mechanism: :map! (e.g. put an ! after the map).

	Map and unmap commands with ! apply only to input, others apply

	only to command mode.

	The new option "timeout" (default on) causes macros to time out

	after one second.  Turn it off and they will wait forever.

	By using map! and setting notimeout, it is possible to get the

	effect of emacs abbreviation mode.  Sanity checking is turned off

	for map when ! is present.  This is a crude facility and does not

	take into account things like the abbreviation being part of a longer

	word.  It also does not echo until it is satisfied.

	The new option "remap" (default on) causes the editor to attempt

	to map the result of a macro mapping again until the mapping fails.

	This makes it possible, say, to map q to # and #1 to something else

	and get q1 mapped to something else.  Turning it off makes it possible

	to map ^L to l and map ^R to ^L without having ^R map to l.

	The new option "undomacro" (default on) makes it possible to undo

	macros as a unit.  Leaving it off causes macros not to be treated

	specially.  Macros with zero or one change work better with noum,

	with two or more changes better with um.  This option may go away

	if it becomes unnecessary.

	The new (string) valued option "tags" allows you to specify a list

	of tag files, similar to the "path" variable of csh.  The files

	are separated by spaces (which are entered preceded by a backslash)

	and are searched left to right.  The default value is

	"tags /usr/lib/tags", which has the same effect as before.

	It is recommended that "tags" always be the first entry.

	On Ernie, /usr/lib/tags contains entries for the system defined

	library procedures from section 3 of the manual.

	^R is now the same as ^L on terminals where the right arrow key

	sends ^L (The tvi and the adm 31).

	Looking for a tag now uses binary search.

	The "q" command from visual no longer works at all.  You must

	use "Q" to get to ex command mode.

	A minor incompatibility with the v7 ed has been fixed.  Previously,

	to do a global substitute with an escaped newline in the rhs, you

	had to put two \'s in ex and one in ed.  Ex now accepts the single

	form as well as the double form.  For example, instead of

		g/foo/s//foo\\

		bar/g

	(which still works), you can now type, as in ed,

		g/foo/s//foo\

		bar/g

	This means that the following ex command, which used to "work":

		g/foo/s//foo bar\

		.+1,/mumble/d

	won't work anymore unless you put the trailing / on the substitution.

	This usage is pretty obscure anyway.

	Several bugs relating to undoing macros have been fixed.

	A bug which caused the command "g/pattern" to print an error

	message if "pattern" occurred on the last line has been fixed.

	If you reply ":" to "Hit return to continue", you will again be

	asked "Hit return to continue" after the next command finishes.

	Limits have been raised so that an Ann Arbor terminal can be used,

	and long tags can now be accomodated.

	The maximum length of a string valued option has been raised from

	32 to 64, for the benefit of the "tags" option.

	It is now possible to search for an escape or delete using f, F, t,

	T, ;, and ,.  These characters must be quoted with ^V.

	The option "ttytype" is now in correct alphabetical order.

	A bug that caused HP terminals to mess up in insert mode when inserting

	before a tab which follows 7 or fewer characters at the beginning of a

	line (such as a tags file) has been fixed.

	It is now possible to include control D in your EXINIT or .exrc.

	A bug which caused the screen to mess up when a glob (such as xx*)

	doesn't match anything has been fixed.

	The editor now checks for extra junk after a /r.e./ from visual

	(other than the allowed z command) and beeps if any is found.

	Previously it was just ignored.

	A bug that caused j and k (up and down) to behave strangely after

	an insertion has been fixed.

	A bug which causes term to be displayed incorrectly and which

	caused a crash when changing terminal type when there happened

	to be several |'s and a long string in genbuf has been fixed.

	This bug was introduced in ex 2.9.

	The patch for echo lines longer than 80 characters has been

	repaired to do "Hit return to continue" after such lines and

	print the entire output.

	A bug that caused a messed up screen after a :sh command from

	open mode has been fixed.

	A bug which caused a tag request for a nonexistant tag to leave

	the editor in nomagic mode has been fixed.

	A bug which caused strange behavior if there is no default file

	name when an autowrite save is attempted has been fixed.

	A bug which caused the cursor to go to the wrong position when

	^^D or 0^D is entered from column 2 in autoindent mode on terminals

	that can backspace has been fixed.

Version 3.2 -- January 4, 1980

	A bug that caused nomagic to be set if an error happened within

	a tag command has been fixed.

	A bug that caused put commands to beep after a macro containing

	an error has been fixed.

	The mapinput option has been placed in alphabetical order.

	A bug that caused undo to undo more than one macro invocation

	on the same line has been fixed.

	On non VM/UNIX systems, the screen size has been increased to

	allow a 40 X 80 Ann Arbor to be used.

Version 3.2 -- December 28, 1980

	Several limits have been increased for VM/UNIX.  Longer lines,

	more characters of file names, longer regular expressions, etc.

	Huge files can now be edited directly.  Larger terminals (up to

	66 lines) can be used.

	An internal change has been made for VM/UNIX that causes error

	messages to be stored directly instead of in a disk file.

	This should cause faster response to errors.

Version 3.1.1 -- December 13, 1979

	A bug that caused nested macros not to be undoable has been fixed.

	A bug that caused pounding on the escape key on terminals with

	arrow keys that send escape sequences to cause undo to screw up

	has been fixed.

	It is now acknowledged that macros cannot contain the put command.

	This is due to the implementation of put - previously a put inside

	a macro dumped a copy of the buffer instead of the desired text and

	left the editor in a very strange state.  Now such a put just beeps.

Version 3.1 -- November 1, 1979

	Versions from 3.1 up are too large to fit on pdp-11's.

	(Special overlay software is expected to be available soon

	for v7 pdp-11 Unix that will make it fit.) Version 2.9

	is 3.1 with only the bug fixes and very few of the enhancements.

	2.9 will fit on a pdp-11. Version 2.10 will come out and may

	correspond to 3.2. (It turned out to correspond to 3.3)

	For compatibility with ed:  's<newline>' may be used as a

	command and means '&'.  If you set the option "edcompatible"

	(abbr "ed") the presense or abscence of g and c suffices is

	remembered and can be toggled by repeating the suffices.  The

	suffix "r" makes the substitution into "~" instead of "&".

	A new command line option -w<n> sets the value of window before

	starting ex. Hence: 'vi -w5 file' makes a quick change to a file

	easier at 300 baud.

	Arrow keys on terminals that send more than 1 character now

	work.  Home up keys are supported as are the four directions.

	Ex no longer looks at the ma= entry in termcap, but uses the

	ku, kd, kl, kr, and kh entries.  (Note that the HP 2621 will

	turn on function key labels, and even then you have to hold

	shift down.  To avoid turning on the labels, and to give up the

	function keys, use terminal type 2621nl instead of 2621.)

	A parameterless macro facility is included from visual. Briefly,

	there are two flavors of macros:

		a) Put the macro body in a buffer register, say x. Then

		   type @x to invoke it. @ may be followed by another @

		   to repeat the last macro.

		   This allows macros up to 512 chars.

		b) Use the map command from command mode (typically in the

		   .exrc file) as follows:

			map lhs rhs

		   where lhs will be mapped to rhs.

		   There are restrictions: lhs's should be 1-keystroke

		   (either 1 char or 1 function key) since they must be

		   entered within 1 second. lhs no longer than 10 chars,

		   rhs no longer than 100. To get " ", "\t", "|", or "\n"

		   into lhs or rhs, escape them with ctrl V. (It may be

		   necessary to escape the ctrl V with ctrl V if the map

		   command is given from visual mode.)

	For 1 shot macros it is best to put the macro in a buffer register

	and map a key to '@r', since this will allow the macro to be edited.

	Macros can be deleted with

		unmap lhs

	The boolean option "mapinput" (mi) will, if on, cause macros to

	be mapped in input mode as well as command mode (in visual only).

	For example, you can define ctrl T to be four spaces with

		:map ^V^T_^V^V____

		:set mi

	where underlines represent spaces and the ctrl V's are necessary

	to get ctrl chars and spaces past various levels, and make ^T be

	a software tab that even works in the middle of a line.

	If the lhs of a macro is "#0" through "#9", this maps the particular

	function key instead of the 2 char # sequence, if the terminal has

	function keys. This only works if termcap has function key entries

	for the particular terminal. For terminals without function keys,

	the sequence #x means function key x, as typed. As a special case,

	on terminals without function keys, the #x sequence need not be

	typed within one second. The character # can be changed by using

	a macro in the usual way:

		map ^V^I #

	to use tab, for example. (This won't affect the map command, which

	still uses #, but just the invocation from visual mode.)

	The undo command will undo an entire macro call as a unit.

	New commands in visual: ^Y and ^E. These glitch the screen up

	and down 1 line, respectively. They can be given counts, controlling

	the number of lines the screen is glitched. They differ from ^U

	and ^D in that the cursor stays over the same line in the buffer

	it was over before rather than staying in the same place on the

	screen. (^Y on a dumb terminal with a full screen will redraw the

	screen moving the cursor up a few lines.) If you're looking for

	mnemonic value in the names, try this: Y is right next to U and

	E is right next to D.

	More new commands in visual: '&' is a synonym for ':&<cr>'.

	'~' changes the case of the letter under the cursor and moves

	to the next character.

	Ex looks in your environment for EXINIT. If it finds it, that

	is used instead of looking for your .exrc. This should make

	entry into ex faster, along with the termlib feature of looking

	for a termcap entry in TERMCAP.

Version 2.13 -- September 23, 1980

	The provisions for changing the window size with a numeric

	prefix argument to certain visual commands have been deleted.

	The correct way to change the window size is to use the z

	command, for example z5<cr> to change the window to 5 lines.

	An undocumented "feature" which caused the ^^ command to return

	to the previous tag, if in the current file, instead of the

	previous file, has been removed.

Version 2.12 -- July 23, 1980

	A change was made to the sys_errlist array in ex_subr.c so that

	Berkeley V7 quotas will produce the right error message.

	A couple of minor bug fixes were made to get the editor to

	compile on version 6.  The option to use 1K BUFSIZ has been

	deleted, since it is no longer used on our 1K system.

Version 2.11 -- June 24, 1980

	The visual page motion commands ^F and ^B now treat any preceding

	counts as number of pages to move, instead of changes to the

	window size.  That is, 2^F moves forward 2 pages.

	A :vi <file> command from visual mode is now treated the same

	as a :edit <file> or :ex <file> command.  The meaning of the

	vi command from ex command mode is not affected.

	A read only mode now lets you guarantee you won't clobber your

	file by accident.  You can set the on/off option "readonly" (ro)

	and writes will fail unless you use an ! after the write.

	Commands such as x, ZZ, and autowrite, and in general anything

	that writes is affected.  This option is turned on if you invoke

	ex with the -R flag.  A new link called "view" has been  created.

	View is just like vi but it sets readonly.

	The editor now supports certain terminals that use strings other

	then \r and \n for return and linefeed by implementing the cr

	and nl termcap options.  (Thanks to UCLA for these enhancements).

	The termcap attribute ns is now checked for, and ex refuses to

	go into visual mode on such a terminal unless it has sf.

	If you change your start and stop characters to something other

	than the default ^S and ^Q, vi now turns them off.  This causes

	people who change them to escape not to lose so badly.

	The quit character is once again turned off so that datamedias

	which send ^\ for the right arrow key work.

	If you type in an unmatched ) or } in showmatch mode, the editor

	will now beep to warn you about your mistake.  The ) or } is

	still accepted.

	Editor scripts can now contain comments.  Begin the comments with "

	(double quote).  Comments can be on their own line or come at the

	end of command lines.  The comment continues to the end of the line.

	The 3rd version of the USG tty driver is now supported, making it

	possible on USG systems to interrupt redrawing the screen and to

	not flush output when interruptable commands take place.

	The rewind command has been added to the list of commands that

	the autowrite option knows about.

	A bug on the USG system where hanging up the phone causes more

	than one SIGHUP to be sent has been compensated for.

	A bug which caused a file that bombed out in the middle of

	an edit command to be considered modified has been fixed.

	The source file ex_io.c has been split into ex_io.c and

	ex_unix.c to avoid a problem where many C compilers overflowed

	the symbol table.

	A bug which prevented turning off your prompt in your .exrc

	has been fixed.

	Some of the code internal to the editor has been rearranged

	and some comments added.

	The bug fix to the USG tty driver to output a null character

	as padding at 1200 baud has been improved to output a DEL

	at 1200 baud or above.

	Terminals with small screens (less than 20 columns or less

	than 5 lines) should now work.

	A bug which prevented you from entering the character DEL

	into the buffer if you changed your interrupt character to

	something else besides DEL has been fixed.

	A bug which caused things like d) and d} to miss the last

	character when they should have deleted to the end of the

	buffer has been fixed.

	A bug which caused the last character to be lost when you

	read in a file with no newline at the end of the last line

	has been fixed.

	A bug that caused garbage to be in the buffer if the temp file

	overflowed has been fixed.

	The character | can now be escaped with \| in file names.

	A bug which caused the editor to not work if the tab stop size

	did not divide the screen width has been fixed.

	A bug on HP terminals that caused the screen to be messed up if

	you scrolled up something that began the same way as the echo line

	has been fixed.

	An old ed bug which caused globals to fail when they did a substitute

	on the next line has been fixed.

	The % operator will now find matching square brackets the same way

	it does parentheses and braces.  It will not display them in

	showmatch mode, however, and will not use a ] to match all ('s.

	Ex looks in your environment for EXINIT. If it finds it, that

	is used instead of looking for your .exrc. This should make

	entry into ex faster, along with the termlib feature of looking

	for a termcap entry in TERMCAP.

	Internally, it is possible to turn off about a dozen different

	options when compiling the editor to make it fit in 64K.

	See the makefile for a list of options.

Version 2.10 -- February 2, 1980 (Corresponds to 3.3)

	The default window sizes have been changed.  At 300 baud the

	window is now 8 lines (was 1/2 the screen size).  At 1200 baud

	the window is now 16 lines (was 2/3 the screen size, which was

	usually also 16 for a typical 24 line CRT).  At 9600 baud the

	window is still the full screen size.  Any baud rate less than

	1200 behaves like 300, any over 1200 like 9600.

	A new command mode command "x" (for "xit") has been added.  This

	is the same as wq but will not bother to write if there have been

	no changes to the file.  The command letter was chosen for

	convenience and compatibilty with hed.

	The command "ZZ" from vi is the same as ":x<cr>".  This is

	the recommended way to leave the editor.  Z must be typed twice

	since this is two easy to type by accident and has such severe

	effects if unintentional.

	The options w300, w1200, and w9600 can be set.  They are synonyms

	for "window", but only apply at 300, 1200, or 9600 baud, resp.

	Thus you can specify you want a 12 line window at 300 baud and

	a 23 line window at 1200 baud with

		:set w300=12 w1200=23

	The "q" command from visual no longer works at all.  You must

	use "Q" to get to ex command mode.

	The editor no longer uses nondestructive space, except when in

	insert mode.  It instead prints the character it would be

	moving over.  This is a real win on terminals that use an

	escape sequence to nd space.

	A minor incompatibility with the v7 ed has been fixed.  Previously,

	to do a global substitute with an escaped newline in the rhs, you

	had to put two \'s in ex and one in ed.  Ex now accepts the single

	form as well as the double form.  For example, instead of

		g/foo/s//foo\\

		bar/g

	(which still works), you can now type, as in ed,

		g/foo/s//foo\

		bar/g

	This means that the following ex command, which used to "work":

		g/foo/s//foo bar\

		.+1,/mumble/d

	won't work anymore unless you put the trailing / on the substitution.

	This usage is pretty obscure anyway.

	A bug which caused the command "g/pattern" to print an error

	message if "pattern" occurred on the last line has been fixed.

	Limits have been raised so that an Ann Arbor terminal can be used,

	and long tags can now be accomodated.

	A bug that caused HP terminals to mess up in insert mode when inserting

	before a tab which follows 7 or fewer characters at the beginning of a

	line (such as a tags file) has been fixed.

	A bug which causes term to be displayed incorrectly and which

	caused a crash when changing terminal type when there happened

	to be several |'s and a long string in genbuf has been fixed.

	This bug was introduced in ex 2.9.

	The patch for echo lines longer than 80 characters has been

	repaired to do "Hit return to continue" after such lines and

	print the entire output.

	A bug that caused a messed up screen after a :sh command from

	open mode has been fixed.

	A bug which caused a tag request for a nonexistant tag to leave

	the editor in nomagic mode has been fixed.

	A bug which caused strange behavior if there is no default file

	name when an autowrite save is attempted has been fixed.

	A bug which caused the cursor to go to the wrong position when

	^^D or 0^D is entered from column 2 in autoindent mode on terminals

	that can backspace has been fixed.

	In order to get 2.10 to fit on a v7 pdp-11, the following features

	have been deleted:

		The MASTERTAGS feature (undocumented use of /usr/lib/tags

		as an alternate tag file)

		Checking that a file being read in is an ascii file.

		Turning off ^Q/^S on a v7 system.

Version 2.9 -- November 1, 1979

	The meanings of semicolon and newline, broken in 2.8, have been fixed.

	Newline with two arguments still prints the range, unless a semicolon

	was present, in which case only the last line is printed. Semicolon

	otherwise behaves as in ed (and ex 2.7).

	For compatibility with ed: '%' is an abbreviation for '1,$'.

	The default starting line for 'z' is '.+1' instead of '.'.

	If 'z' is followed by a number, this number is remembered

	(by setting the scroll option).

	The + options to the command line invocation and to the edit

	command now also work for the next command. In addition, the

	text after the + is no longer limited to a line number or

	/ or ? search string, but can be any single command. (It cannot

	contain spaces except on command line invocation, and then must

	be quoted to make the shell happy.)  The only special case is

	where + is used by itself - this is the same as +$.

	The way window sizes and scrolling commands are based on the options

	window and scroll has been rearranged. All command mode scrolling

	commands (z and ctrl D) are based on scroll: ^D moves scroll lines,

	z moves scroll*2 lines. Everything in visual (^D, ^U, ^F, ^B, z,

	window sizes in general) are based on the window option. The

	defaults are arranged so that everything seems as before, but

	on hardcopy terminals at 300 baud the default for scroll is

	11 instead of 6.

	Whether ex prompts for commands now depends on the setting of the

	prompt variable, so inside script you can say 'set prompt' and

	get ex to prompt.

	Tags are now searched for in nomagic mode instead of the funny

	mode where magic characters were impossible to get.

	Paragraphs and sections with one letter names (such as those

	used by PWB/MM) now work - use a space (escaped by a backslash)

	for the second letter. Default paragraphs and sections are included

	for both MM and MS. (Thanks to adb for this)

	A bug involving 16 bit arithmetic on a vax for the yank command

	has been fixed.

	The text of the mailed message from expreserve has been improved

	slightly.

	The editor now always turns off the XTABS stty bit when in visual

	mode, making terminals that do special things with ^I work.

	The editor now knows about terminals with destructive tabs, like

	the teleray 1061, having the xt option.

	A bug that caused going past column 80 on terminals with insert line

	but not insert char (like the mime, h1500, or i100) to mess up the

	screen has been fixed.

	A bug on 2621's that causes lines longer than 80 chars long with

	embedded tabs to mess up when a tab was inserted has been fixed.

	A bug that caused the wrong line to suddenly appear under very

	rare circumstances involving small window sizes and long lines

	where a search left the cursor on the top line of the screen

	has been fixed.

	The bug that caused inverse video to sometimes be scrolled up

	into the file from an error message has been fixed.

	The join command has been fixed, so that '3,3j' no longer joins

	lines 3 and 4. ('3j' still does.) Thus, '/a/;/b/-j' works right

	even if b is found on the line after a.

	ex -v now finds your .exrc. In related changes, the default in

	vi is now magic and nobeautify.

	If your buffer is empty, ex won't refuse to do an edit, quit,

	or tag command because you haven't done a write.

	A bug causing visual undo not to work after '1,$!cat' has been

	fixed.

	Ex now decides for itself whether to use CBREAK or TIOCSETN

	by whether they are defined in <sgtty.h>. This eliminates much

	of the #ifdef USG or V6 lines. One USG line remains due to a bug

	in the USG tty driver at 1200 baud.

	Note that this will mess up if you use libretro because <sgtty.h>

	has CBREAK and TIOCSETN defined. Take these out of sgtty.h to fix this.

	Termcap options TI and TE have been added.  These strings are 

	respectively output at the beginning and end of the editing session.

	Values for the set command may now include `\ ' for space and

	control characters.

	Changes have been made to /etc/termcap (several new fields have

	been added) and to termlib (it now looks for TERMCAP in the environment

	and treats it as a termcap entry if the name of the terminal mentioned

	is the same as TERM and the entry doesn't start with a slash.

	If it starts with a slash it is treated as a filename, as before.

	Termcap also checks the 512 byte entry limit and skips lines beginning

	with # as comments. It is possible to define one terminal as being

	similar to another one with a few differences without making two

	copies of the description.) New termcap fields:

		ti	terminal initialization string. This should be sent

			out at the beginning of any program that addresses

			the cursor.

		te	Like te but at end of the program.

			(Thanks to adb for these two fields)

		us	Start underlining.

		ue	End underlining.

		uc	Underline one character & move over it.

		hc	(bool) terminal is hardcopy

		ns	(bool) terminal doesn't scroll (tektronix)

		ff	(bool) hardcopy knows ^L means formfeed.

		pt	(bool) hardware tabs, maybe set by is

		xt	(bool) destructive tabs (teleray 1061)

		ku	sequence sent by keypad "up" arrow

		kd	"down" arrow

		kl	"left" arrow

		kr	"right" arrow

		kh	"home" arrow

		ks	sequence to make keypad send these codes

		ke	sequence to make keypad not send these codes.

		k0-k9	sequences sent by up to 10 "other" keys

		l0-l9	labels on k0-k9. If omitted, default = "f0" - "f9".

		ko	additional keys on keypad, in terms of their

			termcap entry. For example, if "home down" and "clear"

			are present and send the same codes as ll and cl, use