137 lines
3.8 KiB
Groff
137 lines
3.8 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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.\" @(#)printenv.1 8.1 (Berkeley) 6/6/93
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.\" $FreeBSD$
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.\"
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.Dd June 6, 1993
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.Dt PRINTENV 1
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.Os BSD 3
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.Sh NAME
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.Nm printenv , env
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.Nd print out the environment, set and print environment
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.Sh SYNOPSIS
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.Nm
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.Op Ar name
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.Nm env
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.Op Fl
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.Op Fl i
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.Op Ar name=value ...\&
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.Op Ar command
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.Sh DESCRIPTION
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.Nm Printenv
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prints out the names and values of the variables in the environment,
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with one name/value pair per line. If
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.Ar name
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is specified, only
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its value is printed.
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.Pp
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If a
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.Ar name
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is specified and it is not defined in the environment,
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.Nm
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returns exit status 1, else it returns status 0.
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.Pp
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Some shells may provide a builtin
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.Nm
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command which is similar or identical to this utility.
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Consult the
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.Xr builtin 1
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manual page.
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.Pp
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.Nm Env
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executes
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.Ar command
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after modifying the environment as
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specified on the command line. The option
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.Ar name=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 command
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with only those environment values specified.
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The environment inherited
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by
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.Nm env
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is ignored completely.
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.It Fl
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Identical to the
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.Fl i
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option, available for backward compatibility.
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.El
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.Pp
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If no command is specified,
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.Nm env
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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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.Nm env
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is sometimes useful with the
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.Qq #!
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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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.Qq #!/usr/local/bin/foo
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and
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.Qq #!/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 env
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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 SEE ALSO
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.Xr csh 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 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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.Nm Env
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doesn't handle commands with equal (``='') signs in their
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names, for obvious reasons.
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