, emacs, grep/egrep , awk, perl sed. . , . Linux/unix, , " ". . , grep: grep egrep. , . Perl, , . , .
grep, , - ed. g/re/p (global/regular expression/print), .
. _ , grep . grep , . . .
grep _.
/usr/bin/grep [ -bchilnsvw ] __
[ _... ]
/usr/xpg4/bin/grep [ -E | -F ] [ -c | -l | -q ] [ -bhinsvwx ]
-e _... [ -f _ ]...
[ _... ]
:
-e , - .
-f
,
-b - , .
| c | , . |
| h | , , . . |
| i | . |
| l | , , . , . |
| n | ( 1). |
| s | . |
| v | , . |
e _ . _
f _ _. _ . _. -E -F, .
|
|
|
-F . , . , .
-x , .
_ .
1:
"Posix" ( ) text.mm :
example% /usr/bin/grep -i -n posix text.mm
2:
:
example% /usr/bin/grep ^$
example% /usr/bin/grep -v.
3: ,
, abc, def , :
example% /usr/xpg4/bin/grep -E 'abc def'
example% /usr/xpg4/bin/grep -F 'abc def'
