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Annotation of 43BSDReno/old/man/environ.5, revision 1.1.1.1

1.1       root        1: .\" Copyright (c) 1980 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.5   4.1 (Berkeley) 5/15/85
                      6: .\"
                      7: .TH ENVIRON 5
                      8: .UC 4
                      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 `environment' is
                     15: made available by
                     16: .IR exec (2)
                     17: when a process begins.
                     18: By convention these strings have the form
                     19: .RI ` name = value '.
                     20: The following names are used by various commands:
                     21: .TP "\w'TERMCAP 'u"
                     22: PATH
                     23: The sequence of directory prefixes that
                     24: .I sh, time,
                     25: .IR nice (1),
                     26: etc.,
                     27: apply in searching for a file known by an incomplete path name.
                     28: The prefixes are separated by `:'.
                     29: .IR Login (1)
                     30: sets PATH=:/usr/ucb:/bin:/usr/bin.
                     31: .TP
                     32: HOME
                     33: A user's login directory, set by
                     34: .IR login (1)
                     35: from the password file
                     36: .IR passwd (5).
                     37: .TP
                     38: TERM
                     39: The kind of terminal for which output is to be prepared.
                     40: This information is used by commands, such as
                     41: .I nroff
                     42: or
                     43: .IR plot (1),
                     44: which may exploit special terminal capabilities.
                     45: See
                     46: .I /etc/termcap
                     47: .RI ( termcap (5))
                     48: for a list of terminal types.
                     49: .TP
                     50: SHELL
                     51: The file name of the users login shell.
                     52: .TP
                     53: TERMCAP
                     54: The string describing the terminal in TERM,
                     55: or the name of the termcap file, see
                     56: .IR termcap (5), termlib (3).
                     57: .TP
                     58: EXINIT
                     59: A startup list of commands read by
                     60: .IR ex (1),
                     61: .IR edit (1),
                     62: and
                     63: .IR vi (1).
                     64: .TP
                     65: USER
                     66: The login name of the user.
                     67: .PP
                     68: Further names may be placed in the environment by
                     69: the
                     70: .I export
                     71: command and `name=value' arguments in
                     72: .IR sh (1),
                     73: or by the
                     74: .I setenv
                     75: command if you use
                     76: .IR csh (1).
                     77: Arguments may also be placed in the environment at the point of an
                     78: .IR exec (2).
                     79: It is unwise to conflict with
                     80: certain 
                     81: .IR sh (1)
                     82: variables that are frequently exported by
                     83: `.profile' files:
                     84: MAIL, PS1, PS2, IFS.
                     85: .SH SEE ALSO
                     86: csh(1), ex(1), login(1), sh(1), exec(2), system(3), termlib(3), termcap(5), term(7)

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