cut命令

[root@localhost demo]# cat alex.txt
my name is alex.

he love linux.

he like  eat apple.
[root@localhost demo]# cut -c 4 alex.txt #截取每行的第4个字符
n

l

l

[root@localhost demo]# cut -c 4-7 alex.txt #截取每行的4到7个字符
name

love

like


[root@localhost demo]# cut -c 4,6 alex.txt #截取每行的4和6的字符
nm

lv

lk
[root@localhost demo]# cut -c -7 alex.txt #截取每行的第1个字符到第7个字符结束
my name

he love

he like
[root@localhost demo]# cut -c 9- alex.txt #截取每行的第9个字符到结尾
is alex.

linux.

 eat apple.

[root@localhost demo]# cat password
root:x:0:0:root:/root:/bin/bash
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
sync:x:5:0:sync:/sbin:/bin/sync
shutdown:x:6:0:shutdown:/sbin:/sbin/shutdown
halt:x:7:0:halt:/sbin:/sbin/halt
mail:x:8:12:mail:/var/spool/mail:/sbin/nologin
operator:x:11:0:operator:/root:/sbin/nologin
games:x:12:100:games:/usr/games:/sbin/nologin
ftp:x:14:50:FTP User:/var/ftp:/sbin/nologin
nobody:x:99:99:Nobody:/:/sbin/nologin
systemd-network:x:192:192:systemd Network Management:/:/sbin/nologin
dbus:x:81:81:System message bus:/:/sbin/nologin
polkitd:x:999:998:User for polkitd:/:/sbin/nologin
tss:x:59:59:Account used by the trousers package to sandbox the tcsd daemon:/dev/null:/sbin/nologin
abrt:x:173:173::/etc/abrt:/sbin/nologin
sshd:x:74:74:Privilege-separated SSH:/var/empty/sshd:/sbin/nologin
postfix:x:89:89::/var/spool/postfix:/sbin/nologin
[root@localhost demo]# cut -d ":" -f 7 password #指定分隔符号，进行截取第7个区域的内容
/bin/bash
/sbin/nologin
/sbin/nologin
/sbin/nologin
/sbin/nologin
/bin/sync
/sbin/shutdown
/sbin/halt
/sbin/nologin
/sbin/nologin
/sbin/nologin
/sbin/nologin
/sbin/nologin
/sbin/nologin
/sbin/nologin
/sbin/nologin
/sbin/nologin
/sbin/nologin
/sbin/nologin
/sbin/nologin
[root@localhost demo]# cut -d ":" -f 1 password #指定分隔符，进行截取第1个区域的内容
root
bin
daemon
adm
lp
sync
shutdown
halt
mail
operator
games
ftp
nobody
systemd-network
dbus
polkitd
tss
abrt
sshd
postfix
[root@localhost demo]# cut -d ":" -f 1-3 password #指定分隔符，进行截取第一个区域到第三个区域的内容
root:x:0
bin:x:1
daemon:x:2
adm:x:3
lp:x:4
sync:x:5
shutdown:x:6
halt:x:7
mail:x:8
operator:x:11
games:x:12
ftp:x:14
nobody:x:99
systemd-network:x:192
dbus:x:81
polkitd:x:999
tss:x:59
abrt:x:173
sshd:x:74
postfix:x:89
[root@localhost demo]# cut -d ":" -f 1- password #读取所有
root:x:0:0:root:/root:/bin/bash
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
sync:x:5:0:sync:/sbin:/bin/sync
shutdown:x:6:0:shutdown:/sbin:/sbin/shutdown
halt:x:7:0:halt:/sbin:/sbin/halt
mail:x:8:12:mail:/var/spool/mail:/sbin/nologin
operator:x:11:0:operator:/root:/sbin/nologin
games:x:12:100:games:/usr/games:/sbin/nologin
ftp:x:14:50:FTP User:/var/ftp:/sbin/nologin
nobody:x:99:99:Nobody:/:/sbin/nologin
systemd-network:x:192:192:systemd Network Management:/:/sbin/nologin
dbus:x:81:81:System message bus:/:/sbin/nologin
polkitd:x:999:998:User for polkitd:/:/sbin/nologin
tss:x:59:59:Account used by the trousers package to sandbox the tcsd daemon:/dev/null:/sbin/nologin
abrt:x:173:173::/etc/abrt:/sbin/nologin
sshd:x:74:74:Privilege-separated SSH:/var/empty/sshd:/sbin/nologin
postfix:x:89:89::/var/spool/postfix:/sbin/nologin
[root@localhost demo]# cut -d ":" -f 5- password #指定分隔符，读取第5个区域到结尾
root:/root:/bin/bash
bin:/bin:/sbin/nologin
daemon:/sbin:/sbin/nologin
adm:/var/adm:/sbin/nologin
lp:/var/spool/lpd:/sbin/nologin
sync:/sbin:/bin/sync
shutdown:/sbin:/sbin/shutdown
halt:/sbin:/sbin/halt
mail:/var/spool/mail:/sbin/nologin
operator:/root:/sbin/nologin
games:/usr/games:/sbin/nologin
FTP User:/var/ftp:/sbin/nologin
Nobody:/:/sbin/nologin
systemd Network Management:/:/sbin/nologin
System message bus:/:/sbin/nologin
User for polkitd:/:/sbin/nologin
Account used by the trousers package to sandbox the tcsd daemon:/dev/null:/sbin/nologin
:/etc/abrt:/sbin/nologin
Privilege-separated SSH:/var/empty/sshd:/sbin/nologin
:/var/spool/postfix:/sbin/nologin