ENVIRON(7)					       BSD Miscellaneous Information Manual						ENVIRON(7)

NAME

     environ -- user process environment

SYNOPSIS

     extern char **environ;

DESCRIPTION

     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
		      more information.

     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

			    /usr/bin:/bin:/usr/pkg/bin:/usr/local/bin

		      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,
		      the command

			    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.

SEE ALSO

     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)

HISTORY

     The environ manual page appeared in 4.2BSD.

BSD
								 January 21, 2011							       BSD