grep 选项

1:  -A 前向多少行  -B 后向多少行    grep zRR -A 5 -B 5  Or -C  前后各取指定的行数:   grep -n -C10 'failed ' *
^	Beginning-of-line anchor	'^love'	Matches all lines beginning with love.
$	End-of-line anchor	'love$'	Matches all lines ending with love.
.	Matches one character	'l..e'	Matches lines containing an l, followed by two characters, followed by an e.
*	Matches zero or more characters preceding the asterisk	' *love'	Matches lines with zero or more spaces, followed by the pattern love.
[ ]	Matches one character in the set	'[Ll]ove'	Matches lines containing love or Love.
[^]	Matches one character not in the set	'[^A–K]ove'	Matches lines not containing a character in the range A through K, followed by ove.
\<	Beginning-of-word anchor	'\	Matches lines containing a word that begins with love.
\>	End-of-word anchor	'love\>'	Matches lines containing a word that ends with love.
\(..\)	Tags matched characters	'\(love\)ing'	Tags marked portion in a register to be remembered later as number 1. To reference later, use \1 to repeat the pattern. May use up to nine tags, starting with the first tag at the leftmost part of the pattern. For example, the pattern love is saved in register 1 to be referenced later as \1.
x\{m\}   x\{m,\}   x\{m,n\}	Repetition of character x: m times, at least m times, or between m and n times	'o\{5\}'   'o\{5,\}'   'o\{5,10\}'	Matches if line has 5 occurences of o, at least 5 occurences of o, or between 5 and 10 occurrences of o.

 

 

Option	What It Does
–b	Precedes each line by the block number on which it was found. This is sometimes useful in locating disk block numbers by context.
–c	Displays a count of matching lines rather than displaying the lines that match.
–h	Does not display filenames.
–i	Ignores the case of letters in comparisons (i.e., upper- and lowercase are considered identical).
–l	Lists only the names of files with matching lines (once), separated by newline characters.
–n	Precedes each line by its relative line number in the file.
–s	Works silently, that is, displays nothing except error messages. This is useful for checking the exit status.
–v	Inverts the search to display only lines that do not match.
–w	Searches for the expression as a word, as if surrounded by \< and \>. This applies to grep only. (Not all versions of grep support this feature; e.g., SCO UNIX does not.)