Mac OS X / Darwin man pages : environ (7)
environ (7)
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environ - user environment
extern char **environ;
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:
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)
, edit(1)
, and vi(1)
.
- HOME
- A user's login directory, set by login(1)
from the password
file passwd(5)
.
- 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'' initially
by login(1)
.
- PRINTER
- The name of the default printer to be used by lpr(1)
, lpq(1)
,
and lprm(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)
or plot(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.
- 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:/etc/termcap''. TERMPATH is ignored if
TERMCAP contains a full pathname.
- 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.
- LOGNAME
- The login name of the user.
- USER
- Deprecated synonym of LOGNAME (for backwards compatibility).
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.
csh(1)
, ex(1)
, login(1)
, sh(1)
, execve(2)
, execle(3)
, system(3)
,
termcap(3)
, termcap(5)
The environ manual page appeared in 4.2BSD.
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