查看“每天一命令之grep”的源代码


=常用参数=
<pre>
#多个and 
ps -ef | grep  -E 'tomcat1 |tomcat2 |grep -v grep '

grep -rn   sth  somefiles
</pre>

[http://blog.51cto.com/haowen/2068456 find & grep 总结]

== 精准 非贪婪匹配==
<pre> -w, --word-regexp         强制 PATTERN 仅完全匹配字词
              Select  only  those  lines containing matches that form whole words.  The test is that the matching substring must either be at the beginning of the line, or preceded by a
              non-word constituent character.  Similarly, it must be either at the end of the line or followed by a non-word  constituent  character.   Word-constituent  characters  are
              letters, digits, and the underscore.  This option has no effect if -x is also specified.
</pre>
 [[category:shell]]