environ

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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  conven-
       tions  these strings have the form `name=value'.  The fol-
       lowing names are used by various commands:

       PATH   The sequence of directory prefixes that  sh(1)  and
              many  other  programs apply in searching for a file
              known by an incomplete path name.  The prefixes are
              separated by `:'.

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

       SHELL  The file name of the users login shell.

       Further names may be placed  in  the  environment  by  the
       export command and `name=value' 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).  You should
       check not to conflict with certain shell variables,  like:
       MAIL, PS1, PS2, IFS etc.


SEE ALSO

       login(1),  sh(1),  bash  (1),  csh (1), tcsh (1), exec(2),
       system(3)
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