environ man page on NetBSD

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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 specifying a number, in
		      units of a kilobyte by specifying a number followed by
		      ‘K’ or ‘k’, in units of a megabyte by specifying a num‐
		      ber 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 pass‐
		      word 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 stan‐
		      dard 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 information.

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

     Further names may be placed in the environment by the export command and
     name=value arguments in sh(1), or by the setenv command if you use
     csh(1).  It is unwise to change certain sh(1) variables that are fre‐
     quently 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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