2.11BSD#431 - /usr/man/cat7/environ.0

ENVIRON(7)	    UNIX Programmer's Manual	       ENVIRON(7)


NAME
     environ - user environment

SYNOPSIS
     extern char **environ;

DESCRIPTION
     An array of strings called the `environment' is made avail-
     able by execve(2) when a process begins.  By convention
     these strings have the form `name=value'.	The following
     names are used by various commands:

     PATH    The sequence of directory prefixes that sh, time,
	     nice(1), etc., apply in searching for a file known
	     by an incomplete path name.  The prefixes are
	     separated by `:'.	Login(1) sets
	     PATH=:/usr/ucb:/bin:/usr/bin.

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

     TERM    The kind of terminal for which output is to be
	     prepared.	This information is used by commands,
	     such as nroff or plot(1G), which may exploit special
	     terminal capabilities.  See /etc/termcap
	     (termcap(5)) for a list of terminal types.

     SHELL   The file name of the users login shell.

     TERMCAP The string describing the terminal in TERM, or the
	     name of the termcap file, see
	     termcap(5),termcap(3X).

     EXINIT  A startup list of commands read by ex(1), edit(1),
	     and vi(1).

     USER    The login name of the user.

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

     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).	Arguments may also be
     placed in the environment at the point of an execve(2).  It
     is unwise to conflict with certain sh(1) variables that are
     frequently exported by `.profile' files: MAIL, PS1, PS2,
     IFS.

SEE ALSO
     csh(1), ex(1), login(1), sh(1), execve(2), system(3),
     termcap(3X), termcap(5)


Printed 11/26/99	  May 20, 1985				1