cut
cut的工作就是“剪”，具体说就是在文件中负责剪切数据用的。cut命令从文件的每一行剪切字节、字符、和字段并将这些字节、字符和字段输出
基本用法
cut [参数] filename # 说明：默认分割符是制表符
参数说明
| 功能 | |
|---|---|
| -f | 列号，提取第几列 |
| -d | 分隔符，按照指定分隔符分割列 |
案例实操
数据准备
[root@slave2 testshell]# touch cut.txt [root@slave2 testshell]# vim cut.txt dong shen guan zhen wo wo lai lai le le
切割cut.txt第一列
[root@slave2 testshell]# cut -d " " -f 1 cut.txt dong guan wo lai le
切割cut.txt第二、三列
[root@slave2 testshell]# vim cut.txt dong shen si guan zhen chuan wo wo wo lai lai lai le le le [root@slave2 testshell]# cut -d " " -f 2,3 cut.txt shen si zhen chuan wo wo lai lai le le
在cut.txt文件中切割出guan
[root@slave2 testshell]# cat cut.txt | grep ^guan guan zhen chuan [root@slave2 testshell]# cat cut.txt | grep ^guan | cut -d " " -f 1 guan
选取系统PATH变量值，第二个“:”开始后的所有路径
[root@slave2 testshell]# echo $PATH /usr/local/src/kafka_2.11-0.10.2.1/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/usr/local/src/scala-2.11.0/bin:/usr/local/src/spark-2.1.2-bin-hadoop2.6/bin:/usr/local/src/jdk1.8.0_171/bin:/usr/local/src/hadoop-2.6.1/bin:/usr/local/src/zookeeper-3.4.10/bin:/root/bin [root@slave2 testshell]# echo $PATH | cut -d : -f 3- /usr/local/bin:/usr/sbin:/usr/bin:/usr/local/src/scala-2.11.0/bin:/usr/local/src/spark-2.1.2-bin-hadoop2.6/bin:/usr/local/src/jdk1.8.0_171/bin:/usr/local/src/hadoop-2.6.1/bin:/usr/local/src/zookeeper-3.4.10/bin:/root/bin
切割ipconfig后打印的IP地址
[root@slave2 testshell]# ifconfig ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 192.168.242.22 netmask 255.255.255.0 broadcast 192.168.242.255 inet6 fe80::c2d4:1290:9c7c:ca0b prefixlen 64 scopeid 0x20<link> ether 00:0c:29:85:af:c5 txqueuelen 1000 (Ethernet) RX packets 2130943 bytes 2041310938 (1.9 GiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 1429126 bytes 295887628 (282.1 MiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536 inet 127.0.0.1 netmask 255.0.0.0 inet6 ::1 prefixlen 128 scopeid 0x10<host> loop txqueuelen 1000 (Local Loopback) RX packets 1566924 bytes 286612476 (273.3 MiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 1566924 bytes 286612476 (273.3 MiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 [root@slave2 testshell]# ifconfig ens33 ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 192.168.242.22 netmask 255.255.255.0 broadcast 192.168.242.255 inet6 fe80::c2d4:1290:9c7c:ca0b prefixlen 64 scopeid 0x20<link> ether 00:0c:29:85:af:c5 txqueuelen 1000 (Ethernet) RX packets 2131292 bytes 2041345171 (1.9 GiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 1429884 bytes 295953700 (282.2 MiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 [root@slave2 testshell]# ifconfig ens33 | grep "inet " inet 192.168.242.22 netmask 255.255.255.0 broadcast 192.168.242.255 [root@slave2 testshell]# ifconfig ens33 | grep "inet " | cut -d " " -f 10 192.168.242.2