1 .\" Copyright (c) 1983, 1990, 1993
2 .\" The Regents of the University of California. All rights reserved.
4 .\" Redistribution and use in source and binary forms, with or without
5 .\" modification, are permitted provided that the following conditions
7 .\" 1. Redistributions of source code must retain the above copyright
8 .\" notice, this list of conditions and the following disclaimer.
9 .\" 2. Redistributions in binary form must reproduce the above copyright
10 .\" notice, this list of conditions and the following disclaimer in the
11 .\" documentation and/or other materials provided with the distribution.
12 .\" 3. All advertising materials mentioning features or use of this software
13 .\" must display the following acknowledgement:
14 .\" This product includes software developed by the University of
15 .\" California, Berkeley and its contributors.
16 .\" 4. Neither the name of the University nor the names of its contributors
17 .\" may be used to endorse or promote products derived from this software
18 .\" without specific prior written permission.
20 .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 .\" @(#)environ.7 8.3 (Berkeley) 4/19/94
33 .\" $FreeBSD: src/share/man/man7/environ.7,v 1.13.2.4 2001/08/17 13:08:49 ru Exp $
34 .\" $DragonFly: src/share/man/man7/environ.7,v 1.4 2007/09/02 19:30:47 swildner Exp $
43 .Ar extern char **environ ;
45 An array of strings called the
49 when a process begins. By convention these strings have the form
51 The following names are used by various commands:
52 .Bl -tag -width BLOCKSIZE
54 The size of the block units used by several commands, most notably
60 may be specified in units of a byte by specifying a number,
61 in units of a kilobyte by specifying a number followed by ``K'' or
62 ``k'', in units of a megabyte by specifying a number followed by ``M''
63 or ``m'' and in units of a gigabyte by specifying a number followed
65 Sizes less than 512 bytes or greater than a gigabyte are ignored.
69 A startup list of commands read by
74 A user's login directory, set by
76 from the password file
79 This variable configures all programs which use
81 to use the specified locale.
83 The location of the user's
84 mailbox instead of the default in /var/mail,
88 and many other mailclients.
90 Default paginator program. The program specified by this variable is used by
94 etc, to display information which is longer than the current display.
96 The sequence of directories, separated by colons, searched by
101 etc, when looking for an executable file.
103 is set to ``/usr/bin:/bin'' initially by
106 The name of the default printer to be used by
112 The current directory pathname.
114 The full pathname of the user's login shell.
116 The kind of terminal for which output is to be prepared.
117 This information is used by commands, such as
119 which may exploit special terminal capabilities. See
120 .Pa /usr/share/misc/termcap
122 for a list of terminal types.
124 The string describing the terminal in
127 it begins with a '/', the name of the termcap file.
133 A sequence of pathnames of termcap files, separated by colons or spaces,
134 which are searched for terminal descriptions in the order listed. Having
140 .Dq Pa $HOME/.termcap:/etc/termcap .
144 contains a full pathname.
146 The directory in which to store temporary files.
147 Most applications use either
151 Setting this variable will make them use another directory.
153 The timezone to use when displaying dates.
154 The normal format is a pathname relative to
155 .Dq Pa /usr/share/zoneinfo .
156 For example, the command
157 .Dq env TZ=America/Los_Angeles date
158 displays the current time in California.
161 for more information.
163 The login name of the user.
166 Further names may be placed in the environment by the
176 It is unwise to change certain
178 variables that are frequently exported by
186 unless you know what you are doing.
204 manual page appeared in