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ENVIRON(7)	   FreeBSD Miscellaneous Information Manual	    ENVIRON(7)

NAME
     environ -- user 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:

     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.

     EDITOR	Default editor name.

     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	This variable configures all programs which use setlocale(3)
		to use the specified locale.

     MAIL	The location of the user's mailbox instead of the default in
		/var/mail, used by mail(1), sh(1), and many other mailclients.

     PAGER	Default paginator program.  The program specified by this
		variable is used by mail(1), man(1), ftp(1), etc, to display
		information which is longer than the current display.

     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'' initially
		by login(1).

     PRINTER	The name of the default printer to be used by lpr(1), lpq(1),
		and lprm(1).

     PWD	The current directory pathname.

     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) or plot(1)
		which may exploit special terminal capabilities.  See
		/usr/share/misc/termcap (termcap(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.  See TERMPATH below,
		and termcap(5).

     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:/etc/termcap''.  TERMPATH is ignored if
		TERMCAP contains a full pathname.

     TMPDIR	The directory in which to store temporary files.  Most appli-
		cations 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 exam-
		ple, the command ``env TZ=America/Los_Angeles date'' displays
		the current time in California.  See tzset(3) for more infor-
		mation.

     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.

SEE ALSO
     cd(1), csh(1), ex(1), login(1), sh(1), execve(2), execle(3), getenv(3),
     setenv(3), setlocale(3), system(3), termcap(3), termcap(5)

HISTORY
     The environ manual page appeared in 4.2BSD.

FreeBSD 4.9			April 19, 1994			   FreeBSD 4.9