概述
shell是一個指令解釋器，是一個程式/bin/bash,解釋linux的指令,而shell腳本是一系列的指令組成的檔案，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來實作才可以。
需求
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建立使用者
2.執行delete時根據userfile删除使用者
1、腳本内容：
# vim user_ctrl.sh#!/bin/bashread -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 //提示輸入檔案 [ -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檔案行數 for LINE_NUM in `seq 1 $USERLINE` //利用循環建立 do USERNAME=`sed -n "${LINE_NUM}p" $USERFILE` //截取userfile檔案第一行内容 PASSWORD=`sed -n "${LINE_NUM}p" $PASSFILE` //截取passfile檔案第一行内容 useradd $USERNAME //建立使用者 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
2、執行：
[[email protected] mnt]# cat userfile user1user2user3[[email protected] mnt]# cat passfile 123456789[[email protected] mnt]# sh user_ctrl.sh user Please input the operation (create or delete ): hello //輸入錯誤動作Eorror![[email protected] mnt]# sh user_ctrl.sh user Please input the operation (create or delete ): createPlease input the userfile : user //輸入錯誤檔案user is not exist [[email protected] mnt]# sh user_ctrl.sh user Please input the operation (create or delete ): createPlease input the userfile : userfilePlease input the passwdfile ： passfile //建立使用者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.[[email protected] mnt]# sh user_ctrl.sh user Please input the operation (create or delete ): delete //删除使用者Please input the userfile ： userfile[[email protected] mnt]# id user1id: 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~