180 lines
5.1 KiB
Groff
180 lines
5.1 KiB
Groff
.\" Copyright (c) 1983, 1990, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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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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.\" @(#)environ.7 8.3 (Berkeley) 4/19/94
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.\"
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.Dd April 19, 1994
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.Dt ENVIRON 7
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.Os BSD 4.2
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.Sh NAME
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.Nm environ
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.Nd user environment
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.Sh SYNOPSIS
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.Ar extern char **environ ;
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.Sh DESCRIPTION
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An array of strings called the
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.Ar environment
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is made available by
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.Xr execve 2
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when a process begins. By convention these strings have the form
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.Dq Ar name=value .
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The following names are used by various commands:
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.Bl -tag -width BLOCKSIZE
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.It Ev BLOCKSIZE
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The size of the block units used by several commands, most notably
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.Xr df 1 ,
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.Xr du 1
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and
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.Xr ls 1 .
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BLOCKSIZE may be specified in units of a byte by specifying a number,
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in units of a kilobyte by specifying a number followed by ``K'' or
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``k'', in units of a megabyte by specifying a number followed by ``M''
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or ``m'' and in units of a gigabyte by specifying a number followed
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by ``G'' or ``g''.
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Sizes less than 512 bytes or greater than a gigabyte are ignored.
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.It Ev EXINIT
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A startup list of commands read by
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.Xr ex 1 ,
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.Xr edit 1 ,
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and
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.Xr vi 1 .
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.It Ev HOME
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A user's login directory, set by
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.Xr login 1
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from the password file
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.Xr passwd 5 .
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.It Ev PATH
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The sequence of directories, separated by colons, searched by
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.Xr csh 1 ,
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.Xr sh 1 ,
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.Xr system 3 ,
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.Xr execvp 3 ,
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etc, when looking for an executable file.
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PATH is set to ``:/usr/ucb:/bin:/usr/bin'' initially by
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.Xr login 1 .
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.It Ev PRINTER
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The name of the default printer to be used by
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.Xr lpr 1 ,
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.Xr lpq 1 ,
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and
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.Xr lprm 1 .
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.It Ev SHELL
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The full pathname of the user's login shell.
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.It Ev TERM
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The kind of terminal for which output is to be prepared.
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This information is used by commands, such as
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.Xr nroff 1
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or
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.Xr plot 1
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which may exploit special terminal capabilities. See
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.Pa /usr/share/misc/termcap
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.Pq Xr termcap 5
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for a list of terminal types.
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.It Ev TERMCAP
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The string describing the terminal in TERM, or, if
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it begins with a '/', the name of the termcap file.
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See
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.Ev TERMPATH
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below,
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.Xr termcap 5 ,
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and
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.Xr termcap .
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.It Ev TERMPATH
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A sequence of pathnames of termcap files, separated by colons or spaces,
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which are searched for terminal descriptions in the order listed. Having
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no
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.Ev TERMPATH
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is equivalent to a
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.Ev TERMPATH
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of
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.Dq Pa $HOME/.termcap:/etc/termcap .
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.Ev TERMPATH
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is ignored if
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.Ev TERMCAP
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contains a full pathname.
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.It Ev TMPDIR
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The directory in which to store temporary files.
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Most applications use either
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.Dq /tmp
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or
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.Dq /var/tmp .
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Setting this variable will make them use another directory.
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.It Ev TZ
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The timezone to use when displaying dates.
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The normal format is a pathname relative to
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.Dq /usr/share/zoneinfo .
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For example, the command
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.Dq env TZ=US/Pacific date
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displays the current time in California.
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See
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.Xr tzset 3
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for more information.
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.It Ev USER
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The login name of the user.
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.El
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.Pp
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Further names may be placed in the environment by the
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.Xr export
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command and
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.Ar name=value
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arguments in
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.Xr sh 1 ,
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or by the
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.Xr setenv
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command if you use
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.Xr csh 1 .
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It is unwise to change certain
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.Xr sh 1
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variables that are frequently exported by
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.Pa .profile
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files, such as
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.Ev MAIL ,
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.Ev PS1 ,
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.Ev PS2 ,
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and
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.Ev IFS ,
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unless you know what you are doing.
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.Sh SEE ALSO
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.Xr csh 1 ,
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.Xr ex 1 ,
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.Xr login 1 ,
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.Xr sh 1 ,
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.Xr execve 2 ,
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.Xr execle 3 ,
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.Xr system 3 ,
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.Xr termcap 3 ,
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.Xr termcap 5
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.Sh HISTORY
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The
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.Nm environ
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manual page appeared in
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.Bx 4.2 .
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