


      ENVIRON(5)                  (UNIX 5.0)                 ENVIRON(5)



      NAME
           environ - user environment

      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(1), time(1),
                nice(1), nohup(1), etc., apply in searching for a file
                known by an incomplete path name.  The prefixes are
                separated by colons (:).  Login(1) sets
                PATH=:/bin:/usr/bin.
           HOME Name of the 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 mm(1) or tplot(1), which may exploit special
                capabilities of that terminal.
           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
           exec(2).  It is unwise to conflict with certain shell
           variables that are frequently exported by .profile files:
           MAIL, PS1, PS2, IFS.

      SEE ALSO
           env(1), login(1), sh(1), exec(2), getenv(3C), profile(4),
           term(5).




















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