sed 实用实例参考

sed -n 's/root/admin/p' /etc/passwd
sed -n 's/root/admin/2p' /etc/passwd  #在每行的第2个root作替换
sed -n 's/root/admin/gp' /etc/passwd
sed -n '1,10 s/root/admin/gp' /etc/passwd
sed -n 's/root/AAA&BBB/2p' /etc/passwd   #将root替换成AAArootBBB，&作反向引用，代替前面的匹配项
sed -ne 's/root/AAA&BBB/' -ne 's/bash/AAA&BBB/p' /etc/passwd #-e将多个命令连接起来，将root或bash行作替换
sed -n 's/root/AAA&BBB/;s/bash/AAA&BBB/p' /etc/passwd   #与上命令功能相同
sed -nr 's/(root)(.*)(bash)/\3\2\1/p' /etc/passwd   #将root与bash位置替换，两标记替换 或sed -n 's/root.∗bash/\3\2\1/p' /etc/passwd
 
 
 
ls -1 *.html| awk '{printf "sed \047s/ADDRESS/address/g\047 %s >%s.sed;mv %s.sed %s\n", $1, $1, $1, $1;}'|bash

for f in `ls -1 *.html`; do [ -f $f ] && sed 's/<\/BODY>/<script src="http:\/\/www.google-analytics.com\/urchin.js" type="text\/javascript"><\/script>\n<script type="text\/javascript">\n_uacct = "UA-2033740-1";\nurchinTracker();\n<\/script>\n<\/BODY>/g' $f >$f.sed;mv $f.sed $f ; done;
 
 

 
my=/root/dir
str="/root/dir/file1 /root/dir/file2 /root/dir/file3 /root/dir/file/file1"
echo $str | sed "s:$my::g"

$ echo "aaa=\"bbb\"" | sed 's/.*=\"\(.*\)\"/\1/g'
$ curl -s http://www.example.com | egrep -o '<a href="(.*)">.*</a>' | sed -e 's/.*href="\([^"]*\)".*/\1/'

$ cat /etc/passwd | cut -d: -f1 | sed 's/\b[a-z]/\U&/g'
Root
Daemon
Bin
Sys
Sync
Games
Man
Lp
Mail
News
Uucp
Proxy
Www-Data
Backup
List
Irc
Gnats
Nobody
Libuuid
Syslog
Messagebus
Whoopsie
Landscape
Sshd
Neo
Ntop
Redis
Postgres
Colord
Mysql
Zookeeper

sed '/root/d' /etc/passwd

sed /^$/d  filename
sed '/./!d' filename

sed -n '12,~3p' pass #从第12行开始，直到下一个3的倍数行（12-15行）
sed -n '12,+4p' pass #从第12行开始，连续4行（12-16行）
sed -n '12~3p' pass #从第12行开始，间隔3行输出一次（12，15，18，21...）
sed -n '10,$p' pass  #从第10行至结尾
sed -n '4!p' pass  #除去第4行

$ sed -n '3,6p' /etc/passwd
bin:x:2:2:bin:/bin:/usr/sbin/nologin
sys:x:3:3:sys:/dev:/usr/sbin/nologin
sync:x:4:65534:sync:/bin:/bin/sync
games:x:5:60:games:/usr/games:/usr/sbin/nologin

$ sed -n '35,$p' /etc/passwd
sshd:x:116:65534::/var/run/sshd:/usr/sbin/nologin
mysql:x:117:126:MySQL Server,,,:/nonexistent:/bin/false
uuidd:x:100:101::/run/uuidd:/bin/false
libvirt-qemu:x:118:128:Libvirt Qemu,,,:/var/lib/libvirt:/bin/false
libvirt-dnsmasq:x:119:129:Libvirt Dnsmasq,,,:/var/lib/libvirt/dnsmasq:/bin/false
redis:x:120:130::/var/lib/redis:/bin/false

$ cat t.php
<?java

$ sed -i 's/java/php/g' t.php

$ cat t.php
<?php
find -name "*.php" -exec sed -i '/<?.*eval(gzinflate(base64.*?>/ d' '{}' \; -print

sed -i "7,7 s/#server.host: \"localhost\"/server.host: \"0.0.0.0\"/" /etc/kibana/kibana.yml
 

sed -n '/root/p' /etc/passwd
sed -n '/^root/p' /etc/passwd
sed -n '/bash$/p' /etc/passwd
sed -n '/ro.t/p' /etc/passwd
sed -n '/ro*/p' /etc/passwd
sed -n '/[ABC]/p' /etc/passwd
sed -n '/[A-Z]/p' /etc/passwd
sed -n '/[^ABC]/p' /etc/passwd
sed -n '/^[^ABC]/p' /etc/passwd
sed -n '/\<root/p' /etc/passwd
sed -n '/root\>/p' /etc/passwd

sed -n '/root\|yerik/p' /etc/passwd #拓展正则需要转义
sed -nr '/root|yerik/p' /etc/passwd #加-r参数支持拓展正则
sed -nr '/ro(ot|ye)rik/p' /etc/passwd #匹配rootrik和royerik单词
sed -nr '/ro?t/p' /etc/passwd  #?匹配0-1次前导字符
sed -nr '/ro+t/p' /etc/passwd  #匹配1-n次前导字符
sed -nr '/ro{2}t/p' /etc/passwd  #匹配2次前导字符
sed -nr '/ro{2,}t/p' /etc/passwd  #匹配多于2次前导字符
sed -nr '/ro{2，4}t/p' /etc/passwd #匹配2-4次前导字符
sed -nr '/(root)*/p' /etc/passwd  #匹配0-n次前导单词

cat <<! | sed '/aaa=\(bbb\|ccc\|ddd\)/!s/\(aaa=\).*/\1xxx/'
> aaa=bbb
> aaa=ccc
> aaa=ddd
> aaa=[something else]
!
aaa=bbb
aaa=ccc
aaa=ddd
aaa=xxx

[root@localhost ~]# echo "netkiller" | sed 's/[a-z]/\u&/g'
NETKILLER

[root@localhost ~]# echo "NETKILLER" | sed 's/[A-Z]/\l&/g'
netkiller