ENVIRON(5)              GENIX Programmer's Manual              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  com-
           mands:

           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(1),
                   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),termlib(3).

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

           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).  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.

      SEE ALSO
           csh(1), ex(1),  login(1),  sh(1),  exec(2),  system(3),  termlib(3),
           termcap(5), term(7)










      Printed 11/16/83                                                        1