grep:文本过滤器，
grep "pattern" input_file ....
sed: 流编辑器；
sed "command/PATTERD/"
awk:报告生成器。能够将输入的信息格式化之后显示；包括nawk版本，gawk版本
用法：
awk [option] 'script' file1 file2, ...
awk [option] 'PATTERN {action}' file1, file2. ...
print, printf
1 root@ubuntu-ceph-07:~# echo "this is a test" >>test.txt 2 root@ubuntu-ceph-07:~# awk '{print $0}' test.txt 3 this is a test 4 root@ubuntu-ceph-07:~# awk '{print $1}' test.txt 5 this 6 root@ubuntu-ceph-07:~# awk '{print $2}' test.txt 7 is 8 root@ubuntu-ceph-07:~# awk '{print $1$2}' test.txt 9 thisis 10 root@ubuntu-ceph-07:~# awk 'BEGIN{OFS="#"}{print $1,$2}' test.txt 11 this#is 12 root@ubuntu-ceph-07:~# awk '{print $1,$2}' test.txt 13 this is 14 root@ubuntu-ceph-07:~# awk 'BEGIN{OFS=":"}{print $1, $2, $3, $4}' test.txt 15 this:is:a:test 16 root@ubuntu-ceph-07:~# awk 'BEGIN{OFS=":"}{print $1, $2, "AAAAAAA",$3, $4}' test.txt 17 this:is:AAAAAAA:a:test
地址：http://edu.51cto.com/lesson/id-17373.html
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