http://blog.csdn.net/a81895898/article/details/8482387 Sed是什么 <sed and awk>一书中(1.2 A Stream Editor)是这样解释的: Sed is a "non-interactive" stream-oriented editor. It is stream-oriented because, like many UNIXprograms, input flows through the pr
SED 1.sed是流编辑器(stream editor)缩写,作用主要是文本替换 命令格式:sed ‘s/pattern/replace_string/' file或者cat file | sed 's/pattern/replace_string/' 2.默认情况下sed只会打印替换后的文本,如果需要在替换的同时保存更改,可以使用-i选项,可以将替换结果应用于源文件,很多用户在进行替换后会使用重定向来保存文件: sed ‘s/pattern/replace_string/' fil
第1章 awk数组练习题 1.1 文件内容(仅第一行) [root@znix test]# head -1 secure-20161219 access.log ==> secure-20161219 <== Dec 11 03:49:25 localhost sshd[27087]: Failed password for invalid user support from 123.31.34.190 port 55493 ssh2 ==> access.log <== 101.