4.3BSD-Reno/src/usr.bin/printenv/printenv.1

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.\" Copyright (c) 1980, 1990 The Regents of the University of California.
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms are permitted provided
.\" that: (1) source distributions retain this entire copyright notice and
.\" comment, and (2) distributions including binaries display the following
.\" acknowledgement:  ``This product includes software developed by the
.\" University of California, Berkeley and its contributors'' in the
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.\" all advertising materials mentioning features or use of this software.
.\" Neither the name of the University nor the names of its contributors may
.\" be used to endorse or promote products derived from this software without
.\" specific prior written permission.
.\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
.\" WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
.\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
.\"
.\"     @(#)printenv.1	6.4 (Berkeley) 7/24/90
.\"
.Dd July 24, 1990
.Dt PRINTENV 1
.UC
.Sh NAME
.Nm printenv , env
.Nd print out the environment, set and print environment
.Sh SYNOPSIS
.Nm printenv
.Op Ar name
.Nm env
.Op Fl
.Op Ar name=value \&...
.Op Ar command
.Sh DESCRIPTION
.Nm Printenv
prints out the names and values of the variables in the environment,
with one name/value pair per line.  If
.Ar name
is specified, only
its value is printed.
.Pp
If a
.Ar name
is specified and it is not defined in the environment,
.Nm printenv
returns exit status 1, else it returns status 0.
.Pp
.Nm Env
executes
.Ar command
after modifying the environment as
specified on the command line.  The option
.Ar name=value
specifies
an environmental variable,
.Ar name  ,
with a value of
.Ar value  .
The option
.Sq Fl
causes
.Nm env
to completely ignore the environment
it inherits.
.Pp
If no command is specified,
.Nm env
prints out the names and values
of the variables in the environment, with one name/value pair per line.
.Sh SEE ALSO
.Xr csh 1 ,
.Xr sh 1 ,
.Xr execvp 3 ,
.Xr environ 7
.Sh HISTORY
.Nm Printenv
appeared in 3 BSD.
.Sh BUGS
.Nm Env
doesn't handle commands with equal (``='') signs in their
names, for obvious reasons.