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ENVIRON(7)							    ENVIRON(7)

NAME
       environ - user environment

SYNOPSIS
       extern char *const *environ;

DESCRIPTION
       An  array  of  strings  called  the  `environment' is made available by
       execve(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 shells set
	       PATH=:/bin:/usr/bin.  Note that the empty space between the `='
	       and  the	 `:'  indicates the current directory.	Security aware
	       people move the extra `:' to the end of their path or omit it.

       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 programs that wish  to  exploit  special
	       terminal	 capabilities,	a  screen  oriented  text  editor  for
	       instance.  The terminal type is set by login(1)	from  the  tty
	       database ttytab(5).

       SHELL   The  file  name	of the users login shell, set by login(1) from
	       the password file passwd(5).

       TERMCAP The string describing the terminal in TERM, or the name of  the
	       termcap file, see termcap(5), termcap(3).

       EXINIT  A startup list of commands read by elvis(1).

       USER    The  login  name of the user, set by login(1) from the password
	       file passwd(5).

       LOGNAME Set to the same value as USER.  BSD derived systems have	 USER,
	       System  V  has  LOGNAME,	 so  modern systems have both to avoid
	       problems.

	      Further names may be placed in the environment by the
	      export command and `name=value' arguments in  sh(1).   Arguments
	      may  also be placed in their environment by programs if they use
	      putenv(3).  Or in the environment of another program by building
	      a	 new environment for one of the exec functions that accepts an
	      environment list, like execle(2) or execve(2).  It is unwise  to
	      conflict	with  certain  sh(1) variables that are frequently set
	      and/or exported by `.profile' files: MAIL, PS1, PS2, IFS.

SEE ALSO
       elvis(1), login(1), sh(1), execl(3), execve(2), system(3),  termcap(3),
       termcap(5), passwd(5), ttytab(5).

4.2 Berkeley Distribution	 May 20, 1985			    ENVIRON(7)
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