152 lines
4.2 KiB
Groff
152 lines
4.2 KiB
Groff
.\" Copyright (c) 1983, 1990 The Regents of the University of California.
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\" 3. All advertising materials mentioning features or use of this software
|
|
.\" must display the following acknowledgement:
|
|
.\" This product includes software developed by the University of
|
|
.\" California, Berkeley and its contributors.
|
|
.\" 4. 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 BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" from: @(#)environ.7 6.6 (Berkeley) 7/19/91
|
|
.\" $Id: environ.7,v 1.2 1993/08/01 07:35:06 mycroft Exp $
|
|
.\"
|
|
.Dd July 19, 1991
|
|
.Dt ENVIRON 7
|
|
.Os BSD 4.2
|
|
.Sh NAME
|
|
.Nm environ
|
|
.Nd user environment
|
|
.Sh SYNOPSIS
|
|
.Ar extern char **environ ;
|
|
.Sh DESCRIPTION
|
|
An array of strings called the
|
|
.Ar environment
|
|
is made available by
|
|
.Xr execve 2
|
|
when a process begins. By convention these strings have the form
|
|
.Dq Ar name=value .
|
|
The following names are used by various commands:
|
|
.Bl -tag -width Fl
|
|
.It Ev EXINIT
|
|
A startup list of commands read by
|
|
.Xr ex 1 ,
|
|
.Xr edit 1 ,
|
|
and
|
|
.Xr vi 1 .
|
|
.It Ev HOME
|
|
A user's login directory, set by
|
|
.Xr login 1
|
|
from the password file
|
|
.Xr passwd 5 .
|
|
.It Ev PATH
|
|
The sequence of directories, separated by colons, searched by
|
|
.Xr csh 1 ,
|
|
.Xr sh 1 ,
|
|
.Xr system 3 ,
|
|
.Xr execvp 3 ,
|
|
etc, when looking for an executable file.
|
|
PATH is set to ``:/usr/ucb:/bin:/usr/bin'' initially by
|
|
.Xr login 1 .
|
|
.It Ev PRINTER
|
|
The name of the default printer to be used by
|
|
.Xr lpr 1 ,
|
|
.Xr lpq 1 ,
|
|
and
|
|
.Xr lprm 1 .
|
|
.It Ev SHELL
|
|
The full pathname of the user's login shell.
|
|
.It Ev TERM
|
|
The kind of terminal for which output is to be prepared.
|
|
This information is used by commands, such as
|
|
.Xr nroff 1
|
|
or
|
|
.Xr plot 1
|
|
which may exploit special terminal capabilities. See
|
|
.Pa /usr/share/misc/termcap
|
|
.Pq Xr tmercap 5
|
|
for a list of terminal types.
|
|
.It Ev TERMCAP
|
|
The string describing the terminal in TERM, or, if
|
|
it begins with a '/', the name of the termcap file.
|
|
See
|
|
.Ev TERMPATH
|
|
below,
|
|
.Xr termcap 5 ,
|
|
and
|
|
.Xr termcap .
|
|
.It Ev TERMPATH
|
|
A sequence of pathnames of termcap files, separated by colons or spaces,
|
|
which are searched for terminal descriptions in the order listed. Having
|
|
no
|
|
.Ev TERMPATH
|
|
is equivalent to a
|
|
.Ev TERMPATH
|
|
of
|
|
.Dq Pa $HOME/.termcap:/etc/termcap .
|
|
.Ev TERMPATH
|
|
is ignored if
|
|
.Ev TERMCAP
|
|
contains a full pathname.
|
|
.It Ev USER
|
|
The login name of the user.
|
|
.El
|
|
.Pp
|
|
Further names may be placed in the environment by the
|
|
.Xr export
|
|
command and
|
|
.Ar name=value
|
|
arguments in
|
|
.Xr sh 1 ,
|
|
or by the
|
|
.Xr setenv
|
|
command if you use
|
|
.Xr csh 1 .
|
|
It is unwise to change certain
|
|
.Xr sh 1
|
|
variables that are frequently exported by
|
|
.Pa .profile
|
|
files, such as
|
|
.Ev MAIL ,
|
|
.Ev PS1 ,
|
|
.Ev PS2 ,
|
|
and
|
|
.Ev IFS ,
|
|
unless you know what you are doing.
|
|
.Sh SEE ALSO
|
|
.Xr csh 1 ,
|
|
.Xr ex 1 ,
|
|
.Xr login 1 ,
|
|
.Xr sh 1 ,
|
|
.Xr execve 2 ,
|
|
.Xr execle 3 ,
|
|
.Xr system 3 ,
|
|
.Xr termcap 3 ,
|
|
.Xr termcap 5
|
|
.Sh HISTORY
|
|
The
|
|
.Nm environ
|
|
manual page appeared in
|
|
.Bx 4.2 .
|