environ(5)                                             environ(5)



NAME
     environ - user environment

SYNOPSIS
     extern char **environ;

DESCRIPTION
     An array of strings called the environment is made available
     by exec(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), and so on, apply in searching for a file known
          by an incomplete pathname.  The prefixes are separated
          by :.  login(1) sets

             PATH=:/bin:/usr/bin


     HOME A user's login directory, set by login(1) from the
          password file passwd(4).

     TERM The kind of terminal for which output is to be
          prepared.  This information is used by commands, such
          as nroff, more, or vi, which may exploit special
          terminal capabilities.  See /etc/termcap or
          (termcap(4)) for a list of terminal types.

     SHELL
          The filename of the user's login shell.

     TERMCAP
          The string describing the terminal in TERM, or the name
          of the termcap file, see termcap(4).

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

     LOGNAME
          The login name of the user.

     TZ   Time zone information. The format is xxxnzzz where xxx
          is standard local time zone abbreviation, n is the
          difference in hours from GMT, and zzz is the
          abbreviation for the daylight-saving local time zone,
          if any; for example, EST5EDT.

     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



January 1992                                                    1

environ(5)                                             environ(5)



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

SEE ALSO
     exec(2), system(3S), termcap(4), tty(7)

     csh(1), ex(1), ksh(1), login(1), sh(1) in A/UX Command
     Reference














































2                                                    January 1992