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NetBSD 6.1.5 - man page for environ (netbsd section 7)

ENVIRON(7)		       BSD Miscellaneous Information Manual		       ENVIRON(7)

NAME
     environ -- user process environment

SYNOPSIS
     extern char **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:

     AUDIOCTLDEVICE   The name of the audio control device to be used by audioctl(1),
		      audioplay(1) and audiorecord(1).

     AUDIODEVICE      The name of the audio device to be used by audioplay(1) and audiorecord(1).

     BLOCKSIZE	      The size of the block units used by several commands, most notably df(1),
		      du(1) and ls(1).	BLOCKSIZE may be specified in units of a byte by specify-
		      ing a number, in units of a kilobyte by specifying a number followed by 'K'
		      or 'k', in units of a megabyte by specifying a number followed by 'M' or
		      'm' and in units of a gigabyte by specifying a number followed by 'G' or
		      'g'.  Sizes less than 512 bytes or greater than a gigabyte are ignored.

     EXINIT	      A startup list of commands read by ex(1) and vi(1).

     HOME	      A user's login directory, set by login(1) from the password file passwd(5).

     LANG	      Default for all NLS categories.  Only used if LC_ALL or the environment
		      variable for a particular NLS category is not provided (LC_COLLATE,
		      LC_CTYPE, LC_MESSAGES, LC_MONETARY, LC_NUMERIC, or LC_TIME).

     LC_ALL	      Override for all NLS categories.	If set, overrides the values of
		      LC_COLLATE, LC_CTYPE, LC_MESSAGES, LC_MONETARY, LC_NUMERIC, and LC_TIME.

     LC_COLLATE       NLS string-collation order information.

     LC_CTYPE	      NLS character classification, case conversion, and other character
		      attributes.

     LC_MESSAGES      NLS format for affirmative and negative responses.

     LC_MONETARY      NLS rules and symbols for formatting monetary numeric information.

     LC_NUMERIC       NLS rules and symbols for formatting nonmonetary numeric information.

     LC_TIME	      NLS rules and symbols for formatting time and date information.

     LIBC_DIAGASSERT  Control how the _DIAGASSERT() macro (from <assert.h>) behaves once the
		      assertion is raised.  Refer to _DIAGASSERT(3) for more information.

     LOGNAME	      The login name of the user.

     MALLOC_OPTIONS   Control the behaviour of the malloc() function.  Refer to malloc(3) for
		      more information.

     MIXERDEVICE      The name of the audio mixer device to be used by mixerctl(1).

     PAGER	      The program used for paginating the output of several commands such as
		      man(1).  If null or not set, the standard pagination program more(1) will
		      be used.

     PATH	      The sequence of directories, separated by colons, searched by csh(1),
		      sh(1), system(3), execvp(3), etc, when looking for an executable file.
		      PATH is set to

			    /usr/bin:/bin:/usr/pkg/bin:/usr/local/bin

		      initially by login(1).

     PRINTER	      The name of the default printer to be used by lpr(1), lpq(1), and lprm(1).

     RCMD_CMD	      When using the rcmd(3) function, this variable is used as the program to
		      run instead of rcmd(1).

     SHELL	      The full pathname of the user's login shell.

     TERM	      The kind of terminal for which output is to be prepared.	This information
		      is used by commands, such as nroff(1) which may exploit special terminal
		      capabilities.  See /usr/share/misc/terminfo (terminfo(5)) for a list of
		      terminal types.

     TERMCAP	      The string describing the terminal in TERM, or, if it begins with a '/',
		      the name of the termcap file.  This is only checked if TERMINFO is not set.

     TERMINFO	      The string describing the terminal in TERM, or, if it begins with a '/',
		      the name of the terminfo file.

     TIMEFORMAT       A strftime(3) format string that may be used by programs such as dump(8)
		      for formatting timestamps.

     TMPDIR	      The directory in which to store temporary files.	Most applications use
		      either /tmp or /var/tmp.	Setting this variable will make them use another
		      directory.

     TZ 	      The timezone to use when displaying dates.  The normal format is a pathname
		      relative to /usr/share/zoneinfo.	For example, the command

			    env TZ=US/Pacific date

		      displays the current time in California.	See tzset(3) for more informa-
		      tion.

     USER	      The login name of the user.  It is recommended that portable applications
		      use LOGNAME instead.

     Further names may be placed in the environment by the export command and name=value argu-
     ments in sh(1), or by the setenv command if you use csh(1).  It is unwise to change certain
     sh(1) variables that are frequently exported by .profile files, such as MAIL, PS1, PS2, and
     IFS, unless you know what you are doing.

SEE ALSO
     audioctl(1), audioplay(1), audiorecord(1), csh(1), ex(1), login(1), man(1), more(1), sh(1),
     execve(2), _DIAGASSERT(3), execle(3), malloc(3), rcmd(3), system(3), termcap(3),
     terminfo(3), audio(4), terminfo(5), nls(7), dump(8)

HISTORY
     The environ manual page appeared in 4.2BSD.

BSD					 January 21, 2011				      BSD


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