shell字符截取命令之awk命令

xiaoxiao2021-02-28  50

一 语法     二 实战 [root@localhost ~]# cut -f 2,4 student.txt furong 85 fengj 60 cang 70 [root@localhost ~]# awk '{printf $2 "\t" $4 "\n"}' student.txt furong 85 fengj 60 cang 70 [root@localhost ~]# awk '{print $2 "\t" $4}' student.txt furong 85 fengj 60 cang 70 [root@localhost ~]# df -h|awk '{print $1 "\t" $3}' Filesystem Used /dev/sda3 124M devtmpfs 0 tmpfs 84K tmpfs 7.0M tmpfs 0 /dev/sda5 3.9G /dev/sda7 33M /dev/sda2 1.3G /dev/sda1 153M tmpfs 16K tmpfs 0   三 在awk命令的输出中支持print和printf命令     四 实战 [root@localhost ~]# df -h|grep "/dev/sda5" |awk '{print $5}' 39% [root@localhost ~]# df -h|grep "/dev/sda5" |awk '{print $5}'|cut -d "%" -f 1 39 [root@localhost ~]# awk 'BEGIN{printf "This is a transcript \n"}{printf $2 "\t" $4 "\n"}' student.txt This is a transcript furong 85 fengj 60 cang 70 [root@localhost ~]# awk 'END{printf "This is a transcript \n"}{printf $2 "\t" $4 "\n"}' student.txt furong 85 fengj 60 cang 70 This is a transcript [root@localhost ~]# cat /etc/passwd | grep "/bin/bash" root:x:0:0:root:/root:/bin/bash cakin24:x:1000:1000:cakin24,cakin,cakin,cakin:/home/cakin24:/bin/bash test:x:1003:1001::/home/xxx:/bin/bash cls:x:1001:1001:dgdzmx:/home/cls:/bin/bash [root@localhost ~]# cat /etc/passwd | grep "/bin/bash"|\ > awk 'BEGIN{FS=":"}{printf $1 "\t" $3 "\n"}' root 0 cakin24 1000 test 1003 cls 1001 [root@localhost ~]# cat student.txt |awk '$4>=70{printf $2 "\n"}' furong cang 大小: 72.9 KB 大小: 74.1 KB 查看图片附件
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