nothing!
gnu grep option
-b 块号
-c 只显示多少行match
-h 不显示filename
-i 忽略大小
-l 只display filename
-n print row NO.
-s only print stderr
-v 不用我说了罗
-w only word
grep -E -F -G option
-# print up down # row
-A#
-B#
-C -2
-V i don`t know,gaga!
-e all word is literal like "-love jing" pattern is -love jing
-x all row match
-q 取消stdout when need return value , very nice!!
egrep &grep -E RE
^
$
.
*
[]
[^]
new
+ one or more
? null or one
a|b a or b
() a group word (aaa|bbb)
x花括m花括
x花括m,花括
x花括m,n花括
\w [a-zA-z0-9]
\W [^a-zA-z0-9]
\b word
\< \>
grep like egrep but RE
\( \)
x\花括m\花括
x\花括m,\花括
x\花括m,n\花括
|