148 lines
3.9 KiB
Groff
148 lines
3.9 KiB
Groff
.\" Copyright (c) 1980, 1990, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" This code is derived from software contributed to Berkeley by
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.\" the Institute of Electrical and Electronics Engineers, Inc.
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" From @(#)printenv.1 8.1 (Berkeley) 6/6/93
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.\" From FreeBSD: src/usr.bin/printenv/printenv.1,v 1.17 2002/11/26 17:33:35 ru Exp
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.\" $FreeBSD$
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.\"
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.Dd May 12, 2003
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.Dt ENV 1
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.Os
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.Sh NAME
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.Nm env
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.Nd set and print environment
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.Sh SYNOPSIS
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.Nm
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.Op Fl i
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.Op Ar name Ns = Ns Ar value ...
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.Op Ar utility Op Ar argument ...
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.Sh DESCRIPTION
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The
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.Nm
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utility executes another
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.Ar utility
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after modifying the environment as
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specified on the command line.
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The option
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.Ar name Ns = Ns Ar value
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specifies
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an environment variable,
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.Ar name ,
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with a value of
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.Ar value .
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.Pp
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The options are as follows:
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.Bl -tag -width indent
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.It Fl i
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Execute the
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.Ar utility
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with only those environment variables specified.
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The environment inherited
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by
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.Nm
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is ignored completely.
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.El
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.Pp
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If no
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.Ar utility
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is specified,
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.Nm
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prints out the names and values
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of the variables in the environment, with one name/value pair per line.
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.Pp
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The
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.Nm
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utility is sometimes useful with the
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.Ql #!
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construct (see
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.Xr execve 2 ) .
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The only difference between
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.Dq Li #!/usr/local/bin/foo
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and
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.Dq Li "#!/usr/bin/env /usr/local/bin/foo"
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is that the latter works even if
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.Pa /usr/local/bin/foo
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is itself interpreted.
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Using
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.Nm
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this way also allows one to reference
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.Pa foo
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without the path,
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as well as set up the environment as desired.
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.Sh ENVIRONMENT
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The
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.Nm
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utility uses the
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.Ev PATH
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environment variable to locate the requested
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.Ar utility
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if the name contains no
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.Ql /
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characters.
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.Sh DIAGNOSTICS
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.Ex -std
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An exit status of 126 indicates that
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.Ar utility
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was found, but could not be executed.
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An exit status of 127 indicates that
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.Ar utility
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could not be found.
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.Sh COMPATIBILITY
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The
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.Nm
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utility accepts the
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.Fl
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option as a synonym for
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.Fl i .
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.Sh SEE ALSO
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.Xr printenv 1 ,
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.Xr sh 1 ,
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.Xr execvp 3 ,
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.Xr environ 7
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.Sh STANDARDS
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The
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.Nm
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utility conforms to
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.St -p1003.1-2001 .
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.\".Sh HISTORY
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.\"The
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.\".Nm
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.\"command appeared in
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.\".Bx 3.0 .
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.Sh BUGS
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The
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.Nm
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utility does not handle utility arguments with equal signs
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.Pq Ql =
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in their names, for obvious reasons.
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