APP
sed使用語法
[root@fwq test]# sed --help
使用方法: sed [選項]... {腳本(假設(shè)沒有其它腳本)} [輸入文件]...
? -n, --quiet, --silent???????????????? 取消自己主動打印模式空間
? -e 腳本, --expression=腳本???????????????? 加入“腳本”到程序的執(zhí)行列表
? -f 腳本文件, --file=腳本文件???????????????? 加入“腳本文件”到程序的執(zhí)行列表
? --follow-symlinks???????????????? follow symlinks when processing in place; hard links?will still be broken.
? -i[SUFFIX], --in-place[=SUFFIX]
???????????????? edit files in place (makes backup if extension supplied).
???????????????? The default operation mode is to break symbolic and hard links.
???????????????? This can be changed with --follow-symlinks and --copy.
? -c, --copy
???????????????? use copy instead of rename when shuffling files in -i mode.
???????????????? While this will avoid breaking links (symbolic or hard), the
???????????????? resulting editing operation is not atomic.? This is rarely
???????????????? the desired mode; --follow-symlinks is usually enough, and
???????????????? it is both faster and more secure.
? -l N, --line-length=N???????????????? 指定“l(fā)”命令的換行期望長度
? --posix???????????????? 關(guān)閉全部 GNU 擴展
? -r, --regexp-extended???????????????? 在腳本中使用擴展正則表達式
? -s, --separate???????????????? 將輸入文件視為各個獨立的文件而不是一個長的連續(xù)輸入
? -u, --unbuffered???????????????? 從輸入文件讀取最少的數(shù)據(jù)。更頻繁的刷新輸出
????? --help???? 打印幫助并退出
????? --version? 輸出版本號信息并退出
?
?
打印出行號，并刪除2-5行
[root@fwq test]# nl /etc/passwd | sed '2,5d' |more
???? 1? root:x:0:0:root,704,03738888766,03738888766:/root:/bin/bash
???? 6? sync:x:5:0:sync:/sbin:/bin/sync
???? 7? shutdown:x:6:0:shutdown:/sbin:/sbin/shutdown
???? 8? halt:x:7:0:halt:/sbin:/sbin/halt
???? 9? mail:x:8:12:mail:/var/spool/mail:/sbin/nologin
??? 10? uucp:x:10:14:uucp:/var/spool/uucp:/sbin/nologin
打印出行號，僅僅刪除2-5行
[root@fwq test]# nl /etc/passwd | sed '2d' |more
???? 1? root:x:0:0:root,704,03738888766,03738888766:/root:/bin/bash
???? 3? daemon:x:2:2:daemon:/sbin:/sbin/nologin
???? 4? adm:x:3:4:adm:/var/adm:/sbin/nologin
???? 5? lp:x:4:7:lp:/var/spool/lpd:/sbin/nologin
打印出行號，刪除第2行以后全部內(nèi)容
[root@fwq test]# nl /etc/passwd | sed '2,$d'
???? 1? root:x:0:0:root,704,03738888766,03738888766:/root:/bin/bash
[root@fwq test]#
打印出行號，在第2行后加上“drink tea”
[root@fwq test]# nl /etc/passwd |sed '2a drink tea' | more
???? 1? root:x:0:0:root,704,03738888766,03738888766:/root:/bin/bash
???? 2? bin:x:1:1:bin:/bin:/sbin/nologin
drink tea???? 3? daemon:x:2:2:daemon:/sbin:/sbin/nologin
???? 4? adm:x:3:4:adm:/var/adm:/sbin/nologin
打印出行號。增加2行“drink tea or drink beer”
[root@fwq test]# nl /etc/passwd |sed '2a drink tea or ...
drink beer?
' | more
???? 1? root:x:0:0:root,704,03738888766,03738888766:/root:/bin/bash
???? 2? bin:x:1:1:bin:/bin:/sbin/nologin
drink tea or ...
drink beer?
???? 3? daemon:x:2:2:daemon:/sbin:/sbin/nologin
???? 4? adm:x:3:4:adm:/var/adm:/sbin/nologin
打印出行號，將第2-5行的內(nèi)容更換成“No 2-5”
[root@fwq test]# nl /etc/passwd | sed '2,5c No 2-5 number' | more???? 1? root:x:0:0:root,704,03738888766,03738888766:/root:/bin/bash
No 2-5 number
???? 6? sync:x:5:0:sync:/sbin:/bin/sync
???? 7? shutdown:x:6:0:shutdown:/sbin:/sbin/shutdown
???? 8? halt:x:7:0:halt:/sbin:/sbin/halt
打印出行號。僅列出第5-7行的內(nèi)容
[root@fwq test]# nl /etc/passwd | sed -n '5,7p'???? 5? lp:x:4:7:lp:/var/spool/lpd:/sbin/nologin
???? 6? sync:x:5:0:sync:/sbin:/bin/sync
???? 7? shutdown:x:6:0:shutdown:/sbin:/sbin/shutdown
?
本文摘自 ：https://blog.51cto.com/u
