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), etc., apply in searching for a file known
                   by an incomplete path name.  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 spe-
                   cial terminal capabilities.  See /etc/termcap or
                   (termcap(4)) for a list of terminal types.

          SHELL    The file name 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 is 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
          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.




     April, 1990                                                     1

     environ(5)                                             environ(5)



     SEE ALSO
          csh(1), ex(1), ksh(1), login(1), sh(1), exec(2), system(3S),
          termcap(4), tty(7).




















































     2                                                     April, 1990