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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 1.2 2003/06/17 04:37:00 dillon 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
121 which may exploit special terminal capabilities. See
122 .Pa /usr/share/misc/termcap
124 for a list of terminal types.
126 The string describing the terminal in
129 it begins with a '/', the name of the termcap file.
135 A sequence of pathnames of termcap files, separated by colons or spaces,
136 which are searched for terminal descriptions in the order listed. Having
142 .Dq Pa $HOME/.termcap:/etc/termcap .
146 contains a full pathname.
148 The directory in which to store temporary files.
149 Most applications use either
153 Setting this variable will make them use another directory.
155 The timezone to use when displaying dates.
156 The normal format is a pathname relative to
157 .Dq Pa /usr/share/zoneinfo .
158 For example, the command
159 .Dq env TZ=America/Los_Angeles date
160 displays the current time in California.
163 for more information.
165 The login name of the user.
168 Further names may be placed in the environment by the
178 It is unwise to change certain
180 variables that are frequently exported by
188 unless you know what you are doing.
206 manual page appeared in