awk賦值給變量

#!/bin/bash

open1=`sudo yum list installed | grep jdk | awk 'NR==1{printf $1}'`
open2=`sudo yum list installed | grep jdk | awk 'NR==2{printf $1}'`
echo "--------------------"
echo $open1
echo $open2
echo "--------------------"

sudo yum remove $open1 $open2

shell 刪除open jdk

終端輸入 

sudo yum list installed | grep jdk

後可以看到，機器默認安裝的是open jdk 

java-1.8.0-openjdk.x86_64                 1:1.8.0.101-3.b13.el7_2    @updates   
java-1.8.0-openjdk-headless.x86_64        1:1.8.0.101-3.b13.el7_2    @updates

要想卸載open jdk 就需要這樣一條命令

sudo yum remove java-1.8.0-openjdk.x86_64 java-1.8.0-openjdk-headless.x86_64

最上面的shell既是取到這兩個名包賦值給卸載命令