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Unix Version 7 - man page for environ (v7 section 5)

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ENVIRON(5)									       ENVIRON(5)

       environ - user environment

       extern char **environ;

       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(5).

       TERM   The  kind of terminal for which output is to be prepared.  This information is used
	      by commands, such as nroff or plot(1), which may exploit special terminal capabili-
	      ties.  See term(7) for a list of terminal types.

       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.

       exec(2), sh(1), term(7), login(1)

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