| Цитата(annushka89 @ 29.4.2009, 22:19) | | спасибки, а еще где-то они применяются??? |
Много где применяются. Для примера - набираешь man <чего нибудь>, и в разделе ENVIRONMENT читаешь список этих самых переменных, вместе с описанием, для чего они применяются 
Например, от самого man'а:
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ENVIRONMENT
MANPATH
If MANPATH is set, man uses it as the path to search for manual page files. It
overrides the configuration file and the automatic search path, but is overrid-
den by the -M invocation option. See SEARCH PATH FOR MANUAL PAGES.
MANPL If MANPL is set, its value is used as the display page length. Otherwise, the
entire man page will occupy one (long) page.
MANROFFSEQ
If MANROFFSEQ is set, its value is used to determine the set of preprocessors
run before running nroff or troff. By default, pages are passed through the tbl
preprocessor before nroff.
MANSECT
If MANSECT is set, its value is used to determine which manual sections to
search.
MANWIDTH
If MANWIDTH is set, its value is used as the width manpages should be displayed.
Otherwise the pages may be displayed over the whole width of your screen.
MANPAGER
If MANPAGER is set, its value is used as the name of the program to use to dis-
play the man page. If not, then PAGER is used. If that has no value either,
/usr/bin/less -iRs is used.
LANG If LANG is set, its value defines the name of the subdirectory where man first
looks for man pages. Thus, the command ‘LANG=dk man 1 foo’ will cause man to
look for the foo man page in .../dk/man1/foo.1, and if it cannot find such a
file, then in .../man1/foo.1, where ... is a directory on the search path.
NLSPATH, LC_MESSAGES, LANG
The environment variables NLSPATH and LC_MESSAGES (or LANG when the latter does
not exist) play a role in locating the message catalog. (But the English mes-
sages are compiled in, and for English no catalog is required.) Note that pro-
grams like col(1) called by man also use e.g. LC_CTYPE.
PATH PATH helps determine the search path for manual page files. See SEARCH PATH FOR
MANUAL PAGES.
SYSTEM SYSTEM is used to get the default alternate system name (for use with the -m
option).
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