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28 .\" @(#)environ.7 8.3 (Berkeley) 4/19/94
29 .\" $FreeBSD: src/share/man/man7/environ.7,v 1.13.2.4 2001/08/17 13:08:49 ru Exp $
30 .\" $DragonFly: src/share/man/man7/environ.7,v 1.4 2007/09/02 19:30:47 swildner Exp $
39 .Ar extern char **environ ;
41 An array of strings called the
45 when a process begins. By convention these strings have the form
47 The following names are used by various commands:
48 .Bl -tag -width BLOCKSIZE
50 The size of the block units used by several commands, most notably
56 may be specified in units of a byte by specifying a number,
57 in units of a kilobyte by specifying a number followed by ``K'' or
58 ``k'', in units of a megabyte by specifying a number followed by ``M''
59 or ``m'' and in units of a gigabyte by specifying a number followed
61 Sizes less than 512 bytes or greater than a gigabyte are ignored.
65 A startup list of commands read by
70 A user's login directory, set by
72 from the password file
75 This variable configures all programs which use
77 to use the specified locale.
79 The location of the user's
80 mailbox instead of the default in /var/mail,
84 and many other mailclients.
86 Default paginator program. The program specified by this variable is used by
90 etc, to display information which is longer than the current display.
92 The sequence of directories, separated by colons, searched by
97 etc, when looking for an executable file.
99 is set to ``/usr/bin:/bin'' initially by
102 The name of the default printer to be used by
108 The current directory pathname.
110 The full pathname of the user's login shell.
112 The kind of terminal for which output is to be prepared.
113 This information is used by commands, such as
115 which may exploit special terminal capabilities. See
116 .Pa /usr/share/misc/termcap
118 for a list of terminal types.
120 The string describing the terminal in
123 it begins with a '/', the name of the termcap file.
129 A sequence of pathnames of termcap files, separated by colons or spaces,
130 which are searched for terminal descriptions in the order listed. Having
136 .Dq Pa $HOME/.termcap:/etc/termcap .
140 contains a full pathname.
142 The directory in which to store temporary files.
143 Most applications use either
147 Setting this variable will make them use another directory.
149 The timezone to use when displaying dates.
150 The normal format is a pathname relative to
151 .Dq Pa /usr/share/zoneinfo .
152 For example, the command
153 .Dq env TZ=America/Los_Angeles date
154 displays the current time in California.
157 for more information.
159 The login name of the user.
162 Further names may be placed in the environment by the
172 It is unwise to change certain
174 variables that are frequently exported by
182 unless you know what you are doing.
200 manual page appeared in