plan9port/man/man1/9.1

.TH 9 1
.SH NAME
9, 9.rc, u, u.rc \- run Plan 9 or Unix commands
.SH SYNOPSIS
.B 9
.I cmd
[
.I args
\&...
]
.PP
.B .
.B 9
(from
.MR sh (1) )
.PP
.B 9.rc
.I cmd
[
.I args
\&...
]
.PP
.B .
.B 9.rc
(from
.MR rc (1) )
.PP
.B u
.I cmd
[
.I args
\&...
]
.PP
.B .
.B u
(from
.MR sh (1) )
.PP
.B u.rc
.I cmd
[
.I args
\&...
]
.PP
.B .
.B u.rc
(from
.MR rc (1) )
.SH DESCRIPTION
Because Plan 9 supplies commands with the same name as but different
behavior than many basic Unix system commands
(e.g.,
.BR grep ,
.BR sed ,
.BR mkdir ,
.BR rm ),
it is not recommended to run with the Plan 9 bin directory
ahead of the system directories.
.PP
.I 9
is a shell script that sets up a Plan 9 environment and runs
.I cmd .
It sets
.B $PLAN9
if necessary
and adds
.B $PLAN9/bin
to the beginning of
.B $PATH
before running
.IR cmd .
.PP
If run with no arguments,
.B 9
does not do anything, so it can be invoked from
.IR sh -style
shells using
.B .
.B 9
in order to make the current shell start running in the Plan 9 environment.
.PP
.I 9.rc
is the same as
.I 9
but written for use by the shell
.MR rc (1) .
.PP
.I U
and
.I u.rc
are the inverse of
.I 9
and
.IR 9.rc :
they move
.B $PLAN9/bin
to the end of the path.
.SH EXAMPLES
Search for greek in the password file:
.IP
.EX
$ 9 grep '[α-ζ]' /etc/passwd
.EE
.PP
Start an
.MR rc (1)
with the Plan 9 commands in the path before the system commands,
and then run the Unix
.IR ls :
.IP
.EX
$ 9 rc
% u ls
.EE
.SH SOURCE
.B \*9/bin/9
.br
.B \*9/bin/9.rc
.br
.B \*9/bin/u
.br
.B \*9/bin/u.rc
.SH SEE ALSO
.MR intro (1)
.SH BUGS
Some shell configurations
(notably, oh-my-zsh)
define
.B 9
as an alias for
.B cd
.BR \-9 ,
which makes the
.I 9
command described here inaccessible.
In such shells, it is necessary to
.B unalias
.B 9
in your initialization scripts.