.Dd December 21, 2019
.Dt CHMOD 1
.Os sbase
.Sh NAME
.Nm chmod
.Nd change file modes
.Sh SYNOPSIS
.Nm
.Op Fl R
.Ar mode
.Ar file ...
.Sh DESCRIPTION
.Nm
changes the file mode of each
.Ar file
to
.Ar mode .
.Pp
If
.Ar mode
is
.Em octal
"[sog]e"
.Bl -tag -width Ds
.It s
.Xr sticky 1 => s += 1
.Pp
.Xr setgid 2 => s += 2
.Pp
.Xr setuid 4 => s += 4
.It o|g|e
owner | group | everyone
.Pp
.Xr execute 1 => o|g|e += 1
.Pp
.Xr write 2 => o|g|e += 2
.Pp
.Xr read 4 => o|g|e += 4
.El
.Pp
Leading zeroes may be omitted.
.Pp
If
.Ar mode
is
.Em symbolic
"[ugoa]*[+-=][rwxXst]*"
.Bl -tag -width Ds
.It u|g|o|a
owner | group | other (non-group) | everyone
.It +|-|=
add | remove | set
.It r|w|x|s|t
read | write | execute | setuid and setgid | sticky
.It X
execute, if directory or at least one execute bit is already set
.El
.Pp
Symbolic links are followed if they are passed as operands, and ignored
if they are encountered during directory traversal.
.Sh OPTIONS
.Bl -tag -width Ds
.It Fl R
Change modes recursively.
.El
.Sh SEE ALSO
.Xr chgrp 1 ,
.Xr umask 1
.Sh STANDARDS
POSIX.1-2013.
.Pp
The
.Op Fl HLP
flags are an extension to that specification.