sed命令使用小技巧

sed 's/\(admin.*\)\.\([a-z]\{3\}\)\./a.\2./g' /etc/nginx/conf.d/admin.conf

sed -n '/11:11:/,/12:12:/p' filename

sed -i s/old/new/g filename

sed -i 's/go/stark&/' file

sed -i 's/go/&stark/' file

sed -i '/backup.sh/d' crontab

sed -i '1d;$d' filename

sed -i '/qiao/i\gege' file

sed -i '/qiao/a\gege' file

sed -i '/root/c\rootbajie' /etc/passwd

sed -i 's/^/HEAD&/' file

sed -i 's/$/&tail/' file

sed -i '/Begin/,/End/{s/xxx/ooo/g}' filename

sed 's/\(^[a-z_-]\+\):x:\([0-9]\+\):\([0-9]\+\):.*/\3 \1 \2/' passwd

[root@stark shell]# cat sed_learn.txt 
root /bin/bash
bin /sbin/nologin
sync /bin/sync
shutdown /sbin/shutdown
**使用常用定界符'/',可以看到转义符看起来很混乱**
[root@stark shell]# cat sed_learn.txt |sed 's/\/sbin\/nologin/\/bin\/bash/'
root /bin/bash
bin /bin/bash
sync /bin/sync
shutdown /sbin/shutdown
halt /sbin/halt
**下面替换'/'为其它定界符,可以说整个键盘都是sed可用的定界符**
//*使用特殊符号'!'为定界符(任意特殊符号都可用,不能和替换的内容重复)
[root@stark shell]# cat sed_learn.txt |sed 's!/sbin/nologin!/bin/bash!'
root /bin/bash
bin /bin/bash
sync /bin/sync
shutdown /sbin/shutdown
halt /sbin/halt
//*使用数字'5'作为定界符(任意数字都可用,不能和替换的内容重复)
[root@stark shell]# cat sed_learn.txt |sed 's5/sbin/nologin5/bin/bash5'
root /bin/bash
bin /bin/bash
sync /bin/sync
shutdown /sbin/shutdown
halt /sbin/halt
//*使用字母'z'作为定界符(任意字母都可用,不能和替换的内容重复)
[root@stark shell]# cat sed_learn.txt |sed 'sz/sbin/nologinz/bin/bashz'
root /bin/bash
bin /bin/bash
sync /bin/sync
shutdown /sbin/shutdown
halt /sbin/halt