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.TH CHMOD 1
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.SH NAME
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chmod \- change mode
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.SH SYNOPSIS
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.B chmod
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.I mode file ...
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.SH DESCRIPTION
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The mode of
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each named file
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is changed
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according to
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.IR mode,
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which may be an octal number or a symbolic change to the existing mode.
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A
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.I mode
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is an octal
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number constructed
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from the OR of the
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following modes.
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.TF 0000
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.TP
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0400
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read by owner
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.TP
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0200
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write by owner
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.TP
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0100
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execute (search in directory) by owner
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.TP
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0070
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read, write, execute (search) by group
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.TP
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0007
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read, write, execute (search) by others
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.PD
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.PP
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A symbolic
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.I mode
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has the form:
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.IP
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.RI [who]
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.I op permission
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.PP
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The
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.I who
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part is a combination
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of the letters
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.B u
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(for user's permissions),
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.B g
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(group)
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and
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.B o
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(other).
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The letter
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.B a
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stands for
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.BR ugo .
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If
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.I who
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is omitted,
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the default is
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.BR a .
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.PP
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.I Op
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can be
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.B +
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to add
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.I permission
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to the file's mode,
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.B -
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to take away
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.IR permission ,
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and
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.B =
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to assign
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.I permission
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absolutely
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(all other bits will
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be reset).
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.PP
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.I Permission
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is any combination of the letters
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.B r
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(read),
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.B w
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(write),
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.B x
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(execute),
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.B a
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(append only),
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.B l
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(exclusive access),
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and
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.B t
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(temporary file).
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.PP
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Only the owner of a file or the group leader of its group
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may change the file's mode.
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.SH SOURCE
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.B /sys/src/cmd/chmod.c
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.SH "SEE ALSO"
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.IR ls (1),
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.IR stat (2),
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.IR stat (5)