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Annotation of 43BSDReno/share/man/man7/environ.7, revision 1.1

1.1     ! root        1: .\" Copyright (c) 1983, 1990 The Regents of the University of California.
        !             2: .\" All rights reserved.
        !             3: .\"
        !             4: .\" Redistribution and use in source and binary forms are permitted provided
        !             5: .\" that: (1) source distributions retain this entire copyright notice and
        !             6: .\" comment, and (2) distributions including binaries display the following
        !             7: .\" acknowledgement:  ``This product includes software developed by the
        !             8: .\" University of California, Berkeley and its contributors'' in the
        !             9: .\" documentation or other materials provided with the distribution and in
        !            10: .\" all advertising materials mentioning features or use of this software.
        !            11: .\" Neither the name of the University nor the names of its contributors may
        !            12: .\" be used to endorse or promote products derived from this software without
        !            13: .\" specific prior written permission.
        !            14: .\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            15: .\" WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            16: .\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            17: .\"
        !            18: .\"     @(#)environ.7  6.5 (Berkeley) 6/24/90
        !            19: .\"
        !            20: .Dd June 24, 1990
        !            21: .Dt ENVIRON 7
        !            22: .Os BSD 4.2
        !            23: .Sh NAME
        !            24: .Nm environ
        !            25: .Nd user environment
        !            26: .Sh SYNOPSIS
        !            27: .Ar extern char **environ ;
        !            28: .Sh DESCRIPTION
        !            29: An array of strings called the
        !            30: .Ar environment
        !            31: is made available by
        !            32: .Xr execve  2
        !            33: when a process begins.  By convention these strings have the form
        !            34: .Dq Ar name=value .
        !            35: The following names are used by various commands:
        !            36: .Tw Fl
        !            37: .Tp Ev EXINIT
        !            38: A startup list of commands read by
        !            39: .Xr ex  1  ,
        !            40: .Xr edit  1 ,
        !            41: and
        !            42: .Xr vi  1  .
        !            43: .Tp Ev HOME
        !            44: A user's login directory, set by
        !            45: .Xr login  1
        !            46: from the password file
        !            47: .Xr passwd  5  .
        !            48: .Tp Ev PATH
        !            49: The sequence of directories, separated by colons, searched by
        !            50: .Xr csh  1  ,
        !            51: .Xr sh  1 ,
        !            52: .Xr system  3  ,
        !            53: .Xr execvp  3 ,
        !            54: etc, when looking for an executable file.
        !            55: PATH is set to ``:/usr/ucb:/bin:/usr/bin'' initially by
        !            56: .Xr login  1  .
        !            57: .Tp Ev PRINTER
        !            58: The name of the default printer to be used by
        !            59: .Xr lpr  1  ,
        !            60: .Xr lpq  1 ,
        !            61: and
        !            62: .Xr lprm  1  .
        !            63: .Tp Ev SHELL
        !            64: The full pathname of the user's login shell.
        !            65: .Tp Ev TERM
        !            66: The kind of terminal for which output is to be prepared.
        !            67: This information is used by commands, such as
        !            68: .Xr nroff  1
        !            69: or
        !            70: .Xr plot 1
        !            71: which may exploit special terminal capabilities.  See
        !            72: .Pa /usr/share/misc/termcap
        !            73: .Pq Xr tmercap 5
        !            74: for a list of terminal types.
        !            75: .Tp Ev TERMCAP
        !            76: The string describing the terminal in TERM, or, if
        !            77: it begins with a '/', the name of the termcap file.
        !            78: See
        !            79: .Ev TERMPATH
        !            80: below,
        !            81: .Xr termcap  5  ,
        !            82: and
        !            83: .Xr termcap  .
        !            84: .Tp Ev TERMPATH
        !            85: A sequence of pathnames of termcap files, separated by colons or spaces,
        !            86: which are searched for terminal descriptions in the order listed.  Having
        !            87: no
        !            88: .Ev TERMPATH
        !            89: is equivalent to a
        !            90: .Ev TERMPATH
        !            91: of
        !            92: .Dq Pa $HOME/.termcap:/etc/termcap .
        !            93: .Ev TERMPATH
        !            94: is ignored if
        !            95: .Ev TERMCAP
        !            96: contains a full pathname.
        !            97: .Tp Ev USER
        !            98: The login name of the user.
        !            99: .Tp
        !           100: .Pp
        !           101: Further names may be placed in the environment by the
        !           102: .Xr export
        !           103: command and
        !           104: .Ar name=value
        !           105: arguments in
        !           106: .Xr sh  1  ,
        !           107: or by the
        !           108: .Xr setenv
        !           109: command if you use
        !           110: .Xr csh  1  .
        !           111: It is unwise to change certain
        !           112: .Xr sh  1
        !           113: variables that are frequently exported by
        !           114: .Pa .profile
        !           115: files, such as
        !           116: .Ev MAIL ,
        !           117: .Ev PS1 ,
        !           118: .Ev PS2 ,
        !           119: and
        !           120: .Ev IFS ,
        !           121: unless you know what you are doing.
        !           122: .Sh SEE ALSO
        !           123: .Xr csh 1 ,
        !           124: .Xr ex 1 ,
        !           125: .Xr login 1 ,
        !           126: .Xr sh 1 ,
        !           127: .Xr execve 2 ,
        !           128: .Xr execle 3 ,
        !           129: .Xr system 3 ,
        !           130: .Xr termcap 3 ,
        !           131: .Xr termcap 5
        !           132: .Sh HISTORY
        !           133: .Nm Environ
        !           134: appeared in 4.2 BSD.

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