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environ(7) [ultrix man page]

environ(7)						 Miscellaneous Information Manual						environ(7)

Name
       environ - user environment

Syntax
       extern char **environ;

Description
       An  array  of  strings,	called	the  environment,  is made available by 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 and apply in searching for a file known by an incomplete path name.  The prefixes are sepa-
	       rated by a colon (:).  The command sets

       HOME    A user's login directory, set by from the password file

       TERM    The  kind  of terminal for which output is to be prepared.  This information is used by commands, such as or which may exploit spe-
	       cial terminal capabilities.  See in for a list of terminal types.

       SHELL   The file name of the user's login shell.

       TERMCAP The string describing the terminal in TERM or the name of the termcap file.  For further information, see and

       EXINIT  A startup list of commands read by and

       USER    The login name of the user.

       PRINTER The name of the default printer to be used by and

       Further names may be placed in the environment by the command and ``name=value'' arguments in or by the command if you  use  Arguments  can
       also be placed in the environment at the point of an It is unwise to conflict with certain variables that are frequently exported by files:
       and

See Also
       csh(1), ex(1), login(1), sh(1), execve(2), system(3), termcap(3x), passwd(5), termcap(5)

																	environ(7)

Check Out this Related Man Page

ENVIRON(7)						 Miscellaneous Information Manual						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 termi- nal 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(2), execve(2), system(3), termcap(3), termcap(5), ttytab(5). 4.2 Berkeley Distribution May 20, 1985 ENVIRON(7)

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