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 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/termcap
(termcap(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.
See
TERMPATH
below,
termcap(5),
and
termcap(3).
TERMPATH
-
A sequence of pathnames of termcap files, separated by colons or spaces,
which are searched for terminal descriptions in the order listed.
Having no
TERMPATH
is equivalent to a
TERMPATH
of
``
$HOME/.termcap:/usr/share/misc/termcap
''.
TERMPATH
is ignored if
TERMCAP
contains a full pathname.
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 portable 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 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),
audio(4),
termcap(5),
nls(7),
dump(8)
HISTORY
The
environ
manual page appeared in
4.2BSD.