创建环境

mkdir /c

cat >/c/oldboy.txt<<EOF

o ^word zhaodaoyi word kai tou de hang

o m$ yi m jie wei de hang

^$ biaoshi kong hang,bushi kong ge

o .biaoshi qie zhi neng dai biao ren yi yi ge zi fu  wenben

.* biaoshi suo you

o^.*m yi suo you zi fu kai tou yi zhi dao zi mu

5 jia ji ge shu zi wo qq 110120119

EOF

1.找到以o开头的行，同时以g结尾的行

[root@root c]# grep "^o.*g$" oldboy.txt

o ^word zhaodaoyi word kai tou de hang

o m$ yi m jie wei de hang

2.找到所有的空行并在找到的结果前加上行号

[root@root c]#  grep -n "^$" oldboy.txt

2:

5:

9:

3.找到以所有字符开头到o结束

[root@root c]# grep "o*" oldboy.txt

o ^word zhaodaoyi word kai tou de hang

o m$ yi m jie wei de hang

^$ biaoshi kong hang,bushi kong ge

o .biaoshi qie zhi neng dai biao ren yi yi ge zi fu  wenben

.* biaoshi suo you

o^.*m yi suo you zi fu kai tou yi zhi dao zi mu

5 jia ji ge shu zi wo qq 110120119

4.把所有的小写字母全都换为大写

[root@root c]# tr 'a-z' 'A-Z'< oldboy.txt

O ^WORD ZHAODAOYI WORD KAI TOU DE HANG

O M$ YI M JIE WEI DE HANG

^$ BIAOSHI KONG HANG,BUSHI KONG GE

O .BIAOSHI QIE ZHI NENG DAI BIAO REN YI YI GE ZI FU  WENBEN

.* BIAOSHI SUO YOU

O^.*M YI SUO YOU ZI FU KAI TOU YI ZHI DAO ZI MU

5 JIA JI GE SHU ZI WO QQ 110120119

5.找到不是o或者5开头的行

[root@root c]# grep "^[^05]" oldboy.txt

o ^word zhaodaoyi word kai tou de hang

o m$ yi m jie wei de hang

^$ biaoshi kong hang,bushi kong ge

o .biaoshi qie zhi neng dai biao ren yi yi ge zi fu  wenben

.* biaoshi suo you

o^.*m yi suo you zi fu kai tou yi zhi dao zi mu