2018-03-13 Linux Learning

9.4 sed (UP)

Sed tool example sed-n ' 5 ' p test.txt sed-n ' 1,5 ' p test.txt sed-n ' 1,$ ' P test.txt sed-n '/root/' P test.txt sed -N '/^1/' P test.txt sed-n ' in$ ' P test.txt sed-n '/R. o/' P test.txt sed-n ' oo* ' P test.txt sed-e ' 1 ' p-e '/111/' p-n test.txt [[email protected] sed]# sed-n '/R oot/' P test.txt root:x:0:0:root:/root:/bin/bash operator:x:11:0:operator:/root:/sbin/nologin [[Email protec    Ted] sed]# sed-nr '/o+t/' P test.txt root:x:0:0:root:/root:/bin/bash operator:x:11:0:operator:/root:/sbin/nologin [[email protected] sed]# sed-n ' 2,5 ' p test.txt bin:x:1:1:bin:/bin:/sbin/nologin daemon:x:2:2:daemon:/sbin:/ Sbin/nologin adm:x:3:4:adm:/var/adm:/sbin/nologin Lp:x:4:7:lp:/var/spool/lpd:/sbin/nologin [[email protected ] sed]# sed-n ' 1,$ ' P test.txt [[email protected] sed]# sed-n '/^s/' P test.txt Sync:x:5:0:sync:/sbin:/bin/syn C Shutdown:x:6:0:shutdown:/sbin:/sbin/shutdown Systemd-network:x:192:192:systemD Network Management:/:/sbin/nologin sshd:x:74:74:privilege-separated ssh:/var/empty/sshd:/sbin/nologin [[Email&nbs P;protected] sed]# sed-e ' 1 ' p-e '/bus/' p-n test.txt root:x:0:0:root:/root:/bin/bash dbus:x:81:81:system Message Bus:/:/sbin/nologin [[email protected] sed]# sed-e ' 1 ' p-e '/bus/' p-e '/lp/' p-n test.txt root:x:0:0:root:/r Oot:/bin/bash lp:x:4:7:lp:/var/spool/lpd:/sbin/nologin Dbus:x:81:81:system Message Bus:/:/sbin/nologin

9.5 sed (bottom)

-N Use Quiet (silent) mode. In the usage of general sed, all data from STDIN is generally listed on the screen. However, if you add the-n parameter, only the line (or action) that is specially processed by SED is listed. -P Print-I case-insensitive-D Delete-I modify file contents-R plus-R special symbol does not need add \ de-justification s/a/b/g all replace s/a/b/replace first match & represent front parenthesis sed example SE d ' 1 ' d test.txt sed ' 1,10 ' d test.txt sed '/oot/' d test.txt sed ' 1,2s/ot/to/g ' test.txt sed ' s#ot#ss#g ' test.tx t sed ' s/[0-9]//g ' test.txt sed ' s/[a-za-z]//g ' test.txt sed-r ' s/(Rot) (. *) (bash)/\3\2\1/' test.txt sed ' s/^.         *$/123&/' test.txt sed-i ' s/ot/ss/g ' test.txt [[email protected] sed]# sed-n '/user/' Ip test.txt Ftp:x:14:50:ftp user:/var/ftp:/sbin/nologin Polkitd:x:999:997:user for Polkitd:/:/sbin/nologin [[EMAIL&N        bsp;protected] sed]# sed ' 1,18 ' d test.txt bacula:x:133:133:bacula Backup system:/var/spool/bacula:/sbin/nologin Apache:x:48:48:apache:/usr/share/httpd:/sbin/nologin [[email protected] sed]# head-3 test.txt|sed-r ' s/ roo/aaa/' Aaat:x:0:0:root:/root:/bin/bash bin:x:1:1:bin:/bin:/sbin/nologin Daemon:x:2:2:daemon:/sbin:/sbin/nologin [[email protected ] sed]# head-3 test.txt|sed-r ' s/roo/aaa/g ' Aaat:x:0:0:aaat:/aaat:/bin/bash bin:x:1:1:bin:/bin:/sbin/nolog In Daemon:x:2:2:daemon:/sbin:/sbin/nologin [[email protected] sed]# sed ' s#ot#ss#g ' test.txt ro Ss:x:0:0:ross:/ross:/bin/bash [[email protected] sed]# sed ' s/[0-9]//g ' test.txt root:x:::root:/root:/ Bin/bash Bin:x:::bin:/bin:/sbin/nologin [[email protected] sed]# sed ' s/[a-za-z]//g ' test.txt: : 0:0::/://:: 1:1::/://:: 2:2::/://[[email protected] sed]# head-3 test.txt|sed-r ' s/([^:]+):( . *):([^:]+]/\3!\2!\1/'/bin/bash!x:0:0:root:/root!root/sbin/nologin!x:1:1:bin:/bin!bin/sbin/nologin !x:2:2:daemon:/sbin!daemon [[email protected] sed]# head-3 test.txt|sed-r ' s/(. *)/aaa:&/' Aaa:roo t:x:0:0:root:/root:/bin/Bash Aaa:bin:x:1:1:bin:/bin:/sbin/nologin Aaa:daemon:x:2:2:daemon:/sbin:/sbin/nologin 

2018-03-13 Linux Learning