cut #取列 awk命令的小弟 默认的分隔符为tab键
选项：
-d #指定分隔符
-f #取出指定的列
-c #取出指定的字符 按照行进行处理的
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[root@qls ~]# echo "root:x:0:0:root:/root:/bin/bash" >test.txt [root@qls ~]# cat test.txt root:x:0:0:root:/root:/bin/bash #取出第七列 [root@qls ~]# cut -d ":" -f7 test.txt /bin/bash #取出第一列和第七列 [root@qls ~]# cut -d ":" -f1,7 test.txt root:/bin/bash #取出第五列到第七列 [root@qls ~]# cut -d ":" -f5-7 test.txt root:/root:/bin/bash [root@qls ~]# cut -d ":" -f7 passwd /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 [root@qls ~]# cut -d ":" -f7 passwd | sort /bin/bash /bin/sync /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 /sbin/nologin /sbin/nologin /sbin/shutdown [root@qls ~]# cut -d ":" -f7 passwd | sort | uniq /bin/bash /bin/sync /sbin/halt /sbin/nologin /sbin/shutdown [root@qls ~]# cut -d ":" -f7 passwd | sort | uniq -c 1 /bin/bash 1 /bin/sync 1 /sbin/halt 14 /sbin/nologin 1 /sbin/shutdown [root@qls ~]# cut -d ":" -f7 passwd | sort | uniq -c | sort -n 1 /bin/bash 1 /bin/sync 1 /sbin/halt 1 /sbin/shutdown 14 /sbin/nologin [root@qls ~]# cut -d ":" -f7 passwd | sort | uniq -c | sort -rn 14 /sbin/nologin 1 /sbin/shutdown 1 /sbin/halt 1 /bin/sync 1 /bin/bash [root@qls ~]# cat test.txt root:x:0:0:root:/root:/bin/bash [root@qls ~]# cut -c 6 test.txt x [root@qls ~]# cut -c 6 passwd x : n : 4 x o x x t #取出不同的字符 [root@qls ~]# cut -c 6,8 test.txt x0 #取出连续的字符 [root@qls ~]# cut -c 1-4 test.txt root #取出系统eth0的IP地址 [root@qls ~]# yum install -y net-tools [root@qls ~]# ifconfig eth0 eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 10.0.0.100 netmask 255.255.255.0 broadcast 10.0.0.255 inet6 fe80::3310:9d15:9ee4:43e8 prefixlen 64 scopeid 0x20<link> ether 00:0c:29:eb:ea:8d txqueuelen 1000 (Ethernet) RX packets 1634 bytes 464970 (454.0 KiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 1033 bytes 114568 (111.8 KiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 [root@qls ~]# ifconfig eth0 | head -2 eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 10.0.0.100 netmask 255.255.255.0 broadcast 10.0.0.255 [root@qls ~]# ifconfig eth0 | head -2 | tail -1 inet 10.0.0.100 netmask 255.255.255.0 broadcast 10.0.0.255 [root@qls ~]# ifconfig eth0 | head -2 | tail -1 | cut -d " " -f10 10.0.0.100 [root@qls ~]# ip a s eth0 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000 link/ether 00:0c:29:eb:ea:8d brd ff:ff:ff:ff:ff:ff inet 10.0.0.100/24 brd 10.0.0.255 scope global noprefixroute eth0 valid_lft forever preferred_lft forever inet6 fe80::3310:9d15:9ee4:43e8/64 scope link noprefixroute valid_lft forever preferred_lft forever [root@qls ~]# ip a s eth0 | head -3 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000 link/ether 00:0c:29:eb:ea:8d brd ff:ff:ff:ff:ff:ff inet 10.0.0.100/24 brd 10.0.0.255 scope global noprefixroute eth0 [root@qls ~]# ip a s eth0 | head -3 | tail -1 inet 10.0.0.100/24 brd 10.0.0.255 scope global noprefixroute eth0 [root@qls ~]# ip a s eth0 | head -3 | tail -1 | cut -c 10-19 10.0.0.100 [root@qls ~]# ip a s eth0 | head -3 | tail -1 inet 10.0.0.100/24 brd 10.0.0.255 scope global noprefixroute eth0 [root@qls ~]# ip a s eth0 | head -3 | tail -1 | cut -d " " -f6 10.0.0.100/24 [root@qls ~]# ip a s eth0 | head -3 | tail -1 | cut -d " " -f6 | cut -d "/" -f1 10.0.0.100 |