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)
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 pass-
word 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 provided (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
LC_MESSAGES NLS format for affirmative and negative responses.
LC_MONETARY NLS rules and symbols for formatting monetary numeric
LC_NUMERIC NLS rules and symbols for formatting nonmonetary numeric
LC_TIME NLS rules and symbols for formatting time and date
LIBC_DIAGASSERT Control how the _DIAGASSERT() macro (from <assert.h>)
behaves once the assertion is raised. Refer to
_DIAGASSERT(3) for more information.
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
PAGER The program used for paginating the output of several
commands such as man(1). If null or not set, the stan-
dard 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
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/termcap (termcap(5)) for a list of ter-
TERMCAP The string describing the terminal in TERM, or, if it
begins with a '/', the name of the termcap file. See
TERMPATH below, termcap(5), and termcap(3).
TERMPATH A sequence of pathnames of termcap files, separated by
colons or spaces, which are searched for terminal
descriptions in the order listed. Having no TERMPATH is
equivalent to a TERMPATH of
``$HOME/.termcap:/usr/share/misc/termcap''. TERMPATH is
ignored if TERMCAP contains a full pathname.
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, the command env TZ=US/Pacific date displays
the current time in California. See tzset(3) for more
USER The login name of the user.
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 fre-
quently 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), audio(4), termcap(5), nls(7), dump(8)
The environ manual page appeared in 4.2BSD.
BSD July 20, 2003 BSD