每天一命令之grep
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常用参数
#多个and ps -ef | grep -E 'tomcat1 |tomcat2 |grep -v grep ' grep -rn sth somefiles #比dat 好 ##并 fstab 文件中 有 /data 和 UUID 关键词 grep /data /etc/fstab | grep UUID
精准 非贪婪匹配
-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.