???????
????sed ??????????????????δ????????????????????????????д洢????????????У????“?????”??pattern space??????????sed????????????е???????????????????????????????????????????????У?????????????????????β????????????? ?????????????????洢?????Sed????????????????????????????????????????????д?????????
????sed??ò???
????[root@ wwww ~]# sed [-nefr] [????]
??????????????
????-n ????e???(silent)????????? sed ???÷??У????????? STDIN ????????????г?????????????????? -n ??????????о???sed ????????????(???????)????г?????
????-e ???????????????????? sed ?????????
????-f ?????? sed ?????д??????????? -f filename ????????? filename ??? sed ??????
????-r ??sed ???????????????????????????????(??????????????????)
????-i ???????????????????????????????????
????????????? [n1[??n2]]function
????n1?? n2 ?????????????????????????ж?????????????????????????????????????? 10 ?? 20 ???????е???? 10??20[???????] ??
????function??
????a ???????? a ??????????????????Щ????????μ???г???(?????????)??
????c ??????? c ????????????????Щ?????????? n1??n2 ?????У?
????d ??????????????????????? d ????????????κ??????
????i ?????? i ??????????????????Щ????????μ???г???(?????????)??
????p ?????????????????????????????? p ??????? sed -n ??????С?
????s ??????????????????????????????????? s ?????????????????????????? 1??20s/old/new/g ??????
???????????λ??????/???
?????? /etc/passwd ???????г?????????к?????????? 2~5 ???????
????[root@ wwww ~]# nl /etc/passwd | sed '2??5d'
????1 root:x:0:0:root:/root:/bin/bash
????6 sync:x:5:0:sync:/sbin:/bin/sync
????7 shutdown:x:6:0:shutdown:/sbin:/sbin/shutdown
????.....(???????).....
????sed ?????? ‘2??5d’ ????? d ?????????? 2-5 ?и????????????????????????? 2-5 ????? ?????????￡???????????′? sed -e ??????? -e ?????????????????? sed ?????????????????? ” ???????????????
??????????? 2 ??
????nl /etc/passwd | sed '2d'
?????????? 3 ???????
????nl /etc/passwd | sed '3??$d'
?????????к?(????????????)?????drink tea?????????
????[root@ wwww ~]# nl /etc/passwd | sed '2a drink tea'
????1 root:x:0:0:root:/root:/bin/bash
????2 bin:x:1:1:bin:/bin:/sbin/nologin
????drink tea
????3 daemon:x:2:2:daemon:/sbin:/sbin/nologin
????.....(???????).....
???????????????????
????nl /etc/passwd | sed '2i drink tea'
????????????????????????????к????????????????硺Drink tea or …..????drink beer???
????[root@ www ~]# nl /etc/passwd | sed '2a Drink tea or ......
????> drink beer ?'
????root:x:0:0:root:/root:/bin/bash
????bin:x:1:1:bin:/bin:/sbin/nologin
????Drink tea or ......
????drink beer ?
????daemon:x:2:2:daemon:/sbin:/sbin/nologin
????.....(???????).....
???????????????????б??? ???????????е?????????????????????У????????????????е?????? ?????
???????????λ???滻?????
????????2-5?е?????????????No 2-5 number?????
????[root@ wwww ~]# nl /etc/passwd | sed '2??5c No 2-5 number'
????1 root:x:0:0:root:/root:/bin/bash
????No 2-5 number
????6 sync:x:5:0:sync:/sbin:/bin/sync
????.....(???????).....
?????????????????????????????????????
???????г? /etc/passwd ??????? 5-7 ??
????[root@ wwww ~]# 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
?????????????? sed ?????????λ?????????? ????????????????Щ?к????????????
?????????????????
???????? /etc/passwd??root????????
????nl /etc/passwd | sed '/root/p'
????1  root:x:0:0:root:/root:/bin/bash
????1  root:x:0:0:root:/root:/bin/bash
????2  daemon:x:1:1:daemon:/usr/sbin:/bin/sh
????3  bin:x:2:2:bin:/bin:/bin/sh
????4  sys:x:3:3:sys:/dev:/bin/sh
????5  sync:x:4:65534:sync:/bin:/bin/sync
????....???????
???????root?????????????????У????????????С?
???????-n??????????????????С?
????nl /etc/passwd | sed -n '/root/p'
????1  root:x:0:0:root:/root:/bin/bash
?????????????????
???????/etc/passwd???а???root???У??????????
????nl /etc/passwd | sed  '/root/d'
????2  daemon:x:1:1:daemon:/usr/sbin:/bin/sh
????3  bin:x:2:2:bin:/bin:/bin/sh
????....???????
????#????е????root????????
?????????????????????
????????????eastern???к?
????????/etc/passwd?????root??????У???к??濱?????е???????????????????÷??????????bash?滻?blueshell??????????У?
????nl /etc/passwd | sed -n '/root/{s/bash/blueshell/;p}'
????1  root:x:0:0:root:/root:/bin/blueshell
?????????滻/etc/passwd??????bash??????blueshell?????
????nl /etc/passwd | sed -n '/bash/{s/bash/blueshell/;p;q}'
????1  root:x:0:0:root:/root:/bin/blueshell
???????q???????
???????????????滻
???????????е????????? sed ?????????????λ???в???????????????????????? sed ?????????????? vi ????????????е?????????
????sed 's/???????????/?μ????/g'
??????????????????? /sbin/ifconfig ??? IP
????[root@ wwww ~]# /sbin/ifconfig eth0
????eth0 Link encap:Ethernet HWaddr 00:90:CC:A6:34:84
????inet addr:192.168.1.100 Bcast:192.168.1.255 Mask:255.255.255.0
????inet6 addr: fe80::290:ccff:fea6:3484/64 Scope:Link
????UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
????.....(???????).....
??????????ip??192.168.1.100??
?????? IP ??????????????
????[root@ wwww ~]# /sbin/ifconfig eth0 | grep 'inet addr' | sed 's/^.*addr://g'
????192.168.1.100 Bcast:192.168.1.255 Mask:255.255.255.0
??????????????????????????????? 192.168.1.100 Bcast:192.168.1.255 Mask:255.255.255.0
?????? IP ???????????????
????[root@ wwww ~]# /sbin/ifconfig eth0 | grep 'inet addr' | sed 's/^.*addr://g' | sed 's/Bcast.*$//g'
????192.168.1.100
????????
???????sed???????/etc/passwd?????е??β???????????bash?滻?blueshell
????nl /etc/passwd | sed -e '3??$d' -e 's/bash/blueshell/'
????1  root:x:0:0:root:/root:/bin/blueshell
????2  daemon:x:1:1:daemon:/usr/sbin:/bin/sh
????-e???????????????????????/etc/passwd?????е??β????????????????????bash?滻?blueshell??
?????????????????(Σ?????)
????sed ??????????????????????????ù?????????????????? ???????????????????????????????????????????????????????????????? ??????????????? regular_express.txt ???????????????
???????? sed ?? regular_express.txt ?????н?β??? . ???? !
????[root@ wwww ~]# sed -i 's/.$/!/g' regular_express.txt
???????? sed ????? regular_express.txt ????м???# This is a test??
????[root@ wwww ~]# sed -i '$a # This is a test' regular_express.txt
??????? $ ??????????У??? a ????????????????????????????# This is a test????
????sed ??? -i ?????????????????????????????а???????????????????????? 100 ???е???????????? 100 ?м??Щ??????????? vim ?????????????????????????????? sed ??????? sed ??????/??????????????????????? vim ??????