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.TH YESTERDAY 1
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.SH NAME
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yesterday, diffy \- print file names from the dump
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.SH SYNOPSIS
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.B yesterday
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[
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.B -abcCdDs
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] [
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.B -n
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.I daysago
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] [
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.I \-date
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]
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.I files ...
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.PP
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.B diffy
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[
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.B -abcefmnrw
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]
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.I files ...
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.SH DESCRIPTION
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.I Yesterday
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prints the names of the
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.I files
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from the most recent dump.
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Since dumps are done early in the morning,
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yesterday's files are really in today's dump.
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For example, if today is March 17, 1992,
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.IP
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.EX
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yesterday /adm/users
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.EE
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.PP
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prints
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.IP
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.EX
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/n/dump/1992/0317/adm/users
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.EE
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.PP
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In fact, the implementation is to select the most recent dump in
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the current year, so the dump selected may not be from today.
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.PP
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When presented with a path of the form
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.BI /n/ fs / path \fR,
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.I yesterday
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will look for
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dump files of the form
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\fL/n/\fIfs\fLdump/\fIyyyy\fL/\fIhhmm\fL/\fIpath\fR.
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.PP
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By default,
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.I yesterday
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prints the names of the dump files corresponding to the named files.
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The first set of options changes this behavior.
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.TP
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.B -a
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Run
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.IR acme (1)'s
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.I adiff
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to compare the dump files with the named files.
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.TP
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.B -b
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Bind the dump files over the named files.
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.TP
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.B -c
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Copy the dump files over the named files.
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.TP
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.B -C
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Copy the dump files over the named files only when
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they differ.
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.TP
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.B -d
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Run
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.B diff
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to compare the dump files with the named files.
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.TP
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.B -D
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Run
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.B diff
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.B -n
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to compare the dump files with the named files.
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.PP
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The
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.I date
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option selects other day's dumps, with a format of
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1, 2, 4, 6, or 8 digits of the form
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.IR d,
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.IR dd ,
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.IR mmdd ,
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.IR yymmdd ,
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or
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.IR yyyymmdd .
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.PP
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The
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.B -n
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option selects the dump
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.I daysago
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prior to the current day.
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.PP
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The
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.B -s
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option selects the most recent snapshot instead of the most
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recent archived dump.  Snapshots may occur more frequently
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than dumps.
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.PP
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.I Yesterday
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does not guarantee that the string it prints represents an existing file.
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.PP
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.I Diffy
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runs
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.IR diff (1)
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with the given options
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to compare yesterday's version of each of the named files
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with today's.
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.SH EXAMPLES
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.PP
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Back up to yesterday's MIPS binary of
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.BR vc :
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.IP
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.EX
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yesterday -c /mips/bin/vc
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.EE
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.PP
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Temporarily back up to March 1's MIPS C library to see if a program
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runs correctly when loaded with it:
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.IP
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.EX
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yesterday -b -0301 /mips/lib/libc.a
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rm v.out
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mk
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v.out
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.EE
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.PP
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Find what has changed in the C library since March 1:
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.IP
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.EX
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yesterday -d -0301 /sys/src/libc/port/*.c
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.EE
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.PP
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Find what has changed in the source tree today:
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.IP
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.EX
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diffy -r /sys/src
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.EE
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.SH FILES
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.B /n/dump
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.SH SOURCE
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.B /rc/bin/yesterday
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.br
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.B /rc/bin/diffy
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.SH SEE ALSO
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.IR history (1),
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.IR bind (1),
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.IR diff (1),
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.IR fs (4).
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.SH BUGS
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It's hard to use this command without singing.