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

     environ --	user 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:

     BLOCKSIZE	The size of the	block units used by several commands, most no-
		tably 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

     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 vari-
		able 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=America/Los_Angeles	date" displays the
		current	time in	California.  See tzset(3) for more informa-

     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, un-
     less you know what	you are	doing.

     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)

     The environ manual	page appeared in 4.2BSD.

BSD				April 19, 1994				   BSD


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