shell是一個命令解釋器，是一個程序/bin/bash,解釋linux的命令,而shell腳本是一系列的命令組成的文件，想要熟練掌握shell腳本，唯有不斷練習，接觸各種各樣的需求并用shell來實現才可以。

利用case語句編寫腳本，滿足下列要求

1.執行create時根據userfile和passfile建立用戶

2.執行delete時根據userfile删除用戶

# vim user_ctrl.sh #!/bin/bash read -p "Please input the operation (create or delete ): " OPERATION //輸入你要執行的動作 case $OPERATION in create) //第一種情況：create read -p "Please input the userfile : " USERFILE //提示輸入文件 [ -e $USERFILE ] || { //判斷是否存在 echo "$USERFILE is not exist " exit 1 } read -p "Please input the passwdfile ： " PASSFILE [ -e $PASSFILE ] || { echo "$PASSFILE is not exist " exit 1 } USERLINE=`awk 'BEGIN{N=0}{N }END{print N}' $USERFILE` //計算userfile文件行數 for LINE_NUM in `seq 1 $USERLINE` //利用循環建立 do USERNAME=`sed -n "${LINE_NUM}p" $USERFILE` //截取userfile文件第一行内容 PASSWORD=`sed -n "${LINE_NUM}p" $PASSFILE` //截取passfile文件第一行内容 useradd $USERNAME //建立用戶 echo $PASSWORD | passwd --stdin $USERNAME done ;; delete) //第二種情況：delete read -p "Please input the userfile ： " USERFILE [ -e $USERFILE ] || { echo "$USERFILE is not exist " exit 1 } USERLINE=`awk 'BEGIN{N=0}{N }END{print N}' $USERFILE` for LINE_NUM in `seq 1 $USERLINE` do USERNAME=`sed -n "${LINE_NUM}p" $USERFILE` userdel -r $USERNAME done ;; *) //第三種情況：其餘各種情況 echo Error! ;; esac

[root@localhost mnt]# cat userfile user1 user2 user3 [root@localhost mnt]# cat passfile 123 456 789 [root@localhost mnt]# sh user_ctrl.sh user Please input the operation (create or delete ): hello //輸入錯誤動作 Eorror! [root@localhost mnt]# sh user_ctrl.sh user Please input the operation (create or delete ): create Please input the userfile : user //輸入錯誤文件 user is not exist [root@localhost mnt]# sh user_ctrl.sh user Please input the operation (create or delete ): create Please input the userfile : userfile Please input the passwdfile ： passfile //建立用戶 Changing password for user user1. passwd: all authentication tokens updated successfully. Changing password for user user2. passwd: all authentication tokens updated successfully. Changing password for user user3. passwd: all authentication tokens updated successfully. [root@localhost mnt]# sh user_ctrl.sh user Please input the operation (create or delete ): delete //删除用戶 Please input the userfile ： userfile [root@localhost mnt]# id user1 id: user1: no such user

關于shell腳本就介紹到這了，大家在看需求的時候建議自己先寫一下，然後再對着改進，效果會好一點。後面小編會分享更多linux方面内容，感興趣的朋友走一波關注哩~

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