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1.1       root        1: .\" Copyright (c) 1983 Regents of the University of California.
                      2: .\" All rights reserved.  The Berkeley software License Agreement
                      3: .\" specifies the terms and conditions for redistribution.
                      4: .\"
                      5: .\"    @(#)environ.7   6.4 (Berkeley) 10/14/87
                      6: .\"
                      7: .TH ENVIRON 7 "October 14, 1987"
                      8: .UC 5
                      9: .SH NAME
                     10: environ \- user environment
                     11: .SH SYNOPSIS
                     12: .B extern char **environ;
                     13: .SH DESCRIPTION
                     14: An array of strings called the
                     15: .I environment
                     16: is made available by
                     17: .IR execve (2)
                     18: when a process begins.  By convention these strings have the form
                     19: ``\fIname=value\fP''.  The following names are used by various commands:
                     20: .TP "\w'TERMPATH 'u"
                     21: EXINIT
                     22: A startup list of commands read by
                     23: .IR ex (1),
                     24: .IR edit (1),
                     25: and
                     26: .IR vi (1).
                     27: .TP
                     28: HOME
                     29: A user's login directory, set by
                     30: .IR login (1)
                     31: from the password file
                     32: .IR passwd (5).
                     33: .TP
                     34: PATH
                     35: The sequence of directories, separated by colons, searched by
                     36: .IR csh (1),
                     37: .IR sh (1),
                     38: .IR system (3),
                     39: .IR execvp (3),
                     40: etc, when looking for an executable file.
                     41: PATH is set to ``:/usr/ucb:/bin:/usr/bin'' initially by
                     42: .IR login (1).
                     43: .TP
                     44: PRINTER
                     45: The name of the default printer to be used by
                     46: .IR lpr (1),
                     47: .IR lpq (1),
                     48: and
                     49: .IR lprm (1).
                     50: .TP
                     51: SHELL
                     52: The full pathname of the user's login shell.
                     53: .TP
                     54: TERM
                     55: The kind of terminal for which output is to be prepared.
                     56: This information is used by commands, such as
                     57: .IR nroff (1)
                     58: or
                     59: .IR plot (1G),
                     60: which may exploit special terminal capabilities.  See
                     61: .I /etc/termcap
                     62: .RI ( termcap (5))
                     63: for a list of terminal types.
                     64: .TP
                     65: TERMCAP
                     66: The string describing the terminal in TERM, or, if
                     67: it begins with a '/', the name of the termcap file.
                     68: See TERMPATH below, 
                     69: .IR termcap (5),
                     70: and
                     71: .IR termcap (3X).
                     72: .TP
                     73: TERMPATH
                     74: A sequence of pathnames of termcap files, separated by colons or spaces,
                     75: which are searched for terminal descriptions in the order listed.  Having
                     76: no TERMPATH is equivalent to a TERMPATH of ``$HOME/.termcap:/etc/termcap''.
                     77: TERMPATH is ignored if TERMCAP contains a full pathname.
                     78: .TP
                     79: USER
                     80: The login name of the user.
                     81: .PP
                     82: Further names may be placed in the environment by the
                     83: .I export
                     84: command and
                     85: .IR name = value
                     86: arguments in
                     87: .IR sh (1),
                     88: or by the
                     89: .I setenv
                     90: command if you use
                     91: .IR csh (1).
                     92: It is unwise to change certain 
                     93: .IR sh (1)
                     94: variables that are frequently exported by
                     95: .I .profile
                     96: files, such as MAIL, PS1, PS2, and IFS,
                     97: unless you know what you are doing.
                     98: .SH SEE ALSO
                     99: csh(1), ex(1), login(1), sh(1), execve(2), execle(3),
                    100: system(3), termcap(3), termcap(5)

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