environ man page on 4.4BSD

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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
		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), edit(1), and vi(1).

     HOME	A user's login directory, set by login(1) from the password
		file passwd(5).

     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/ucb:/bin:/usr/bin''
		initially by login(1).

     PRINTER	The name of the default printer to be used by lpr(1), lpq(1),
		and lprm(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) 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,
		termcap(5), and termcap.

     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=US/Pacific date” displays the current time
		in California.	See tzset(3) for more information.

     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.

     csh(1), ex(1), login(1), sh(1), execve(2), execle(3), system(3),
     termcap(3), termcap(5)

     The environ manual page appeared in 4.2BSD.

4.2 Berkeley Distribution	April 19, 1994	     4.2 Berkeley Distribution

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