ENVIRON(7) BSD Miscellaneous Information Manual ENVIRON(7)
environ -- user process environment
extern char **environ;
An array of strings called the environment is made available by execve(2) when a process begins. By convention these strings have the form
``name=value''. The following names are used by various commands:
AUDIOCTLDEVICE The name of the audio control device to be used by audioctl(1), audioplay(1) and audiorecord(1).
AUDIODEVICE The name of the audio device to be used by audioplay(1) and audiorecord(1).
BLOCKSIZE The size of the block units used by several commands, most notably df(1), du(1) and ls(1). BLOCKSIZE may be specified in
units of a byte by specifying a number, in units of a kilobyte by specifying a number followed by 'K' or 'k', in units of a
megabyte by specifying a number followed by 'M' or 'm' and in units of a gigabyte by specifying a number followed by 'G' or
'g'. Sizes less than 512 bytes or greater than a gigabyte are ignored.
EXINIT A startup list of commands read by ex(1) and vi(1).
HOME A user's login directory, set by login(1) from the password file passwd(5).
LANG Default for all NLS categories. Only used if LC_ALL or the environment variable for a particular NLS category is not pro-
vided (LC_COLLATE, LC_CTYPE, LC_MESSAGES, LC_MONETARY, LC_NUMERIC, or LC_TIME).
LC_ALL Override for all NLS categories. If set, overrides the values of LC_COLLATE, LC_CTYPE, LC_MESSAGES, LC_MONETARY,
LC_NUMERIC, and LC_TIME.
LC_COLLATE NLS string-collation order information.
LC_CTYPE NLS character classification, case conversion, and other character attributes.
LC_MESSAGES NLS format for affirmative and negative responses.
LC_MONETARY NLS rules and symbols for formatting monetary numeric information.
LC_NUMERIC NLS rules and symbols for formatting nonmonetary numeric information.
LC_TIME NLS rules and symbols for formatting time and date information.
LIBC_DIAGASSERT Control how the _DIAGASSERT() macro (from <assert.h>) behaves once the assertion is raised. Refer to _DIAGASSERT(3) for
LOGNAME The login name of the user.
MALLOC_OPTIONS Control the behaviour of the malloc() function. Refer to malloc(3) for more information.
MIXERDEVICE The name of the audio mixer device to be used by mixerctl(1).
PAGER The program used for paginating the output of several commands such as man(1). If null or not set, the standard pagination
program more(1) will be used.
PATH The sequence of directories, separated by colons, searched by csh(1), sh(1), system(3), execvp(3), etc, when looking for an
executable file. PATH is set to
initially by login(1).
PRINTER The name of the default printer to be used by lpr(1), lpq(1), and lprm(1).
RCMD_CMD When using the rcmd(3) function, this variable is used as the program to run instead of rcmd(1).
SHELL The full pathname of the user's login shell.
TERM The kind of terminal for which output is to be prepared. This information is used by commands, such as nroff(1) which may
exploit special terminal capabilities. See /usr/share/misc/terminfo (terminfo(5)) for a list of terminal types.
TERMCAP The string describing the terminal in TERM, or, if it begins with a '/', the name of the termcap file. This is only checked
if TERMINFO is not set.
TERMINFO The string describing the terminal in TERM, or, if it begins with a '/', the name of the terminfo file.
TIMEFORMAT A strftime(3) format string that may be used by programs such as dump(8) for formatting timestamps.
TMPDIR The directory in which to store temporary files. Most applications use either /tmp or /var/tmp. Setting this variable will
make them use another directory.
TZ The timezone to use when displaying dates. The normal format is a pathname relative to /usr/share/zoneinfo. For example,
env TZ=US/Pacific date
displays the current time in California. See tzset(3) for more information.
USER The login name of the user. It is recommended that portable applications use LOGNAME instead.
Further names may be placed in the environment by the export command and name=value arguments in sh(1), or by the setenv command if you use
csh(1). It is unwise to change certain sh(1) variables that are frequently exported by .profile files, such as MAIL, PS1, PS2, and IFS,
unless you know what you are doing.
audioctl(1), audioplay(1), audiorecord(1), csh(1), ex(1), login(1), man(1), more(1), sh(1), execve(2), _DIAGASSERT(3), execle(3), malloc(3),
rcmd(3), system(3), termcap(3), terminfo(3), audio(4), terminfo(5), nls(7), dump(8)
The environ manual page appeared in 4.2BSD.
January 21, 2011 BSD