Linux Bash programming case statements and scripting (eight)

Linux Bash programming case statements and scripting (eight)

1.case statement in the following format:

Case variable in

Value 1)

Statement 1

...

;; Each branch statement ends with a semicolon

Value 2)

Statement 2

...

;;

*) Other, equivalent if statement else

Statement 3

...

;;

ESAC the entire case statement ends

2 . Write a script that adds and deletes the user arbitrarily, with the following requirements:

2.1: If the script option is-A or--add:, the user will be added; If the option is-D or--del, the user is deleted,

            If it is-h or--help display Help information, if it is-V or--verbose displays the execution process,

2.2: Parameters following the script option can be arbitrarily specified by multiple users and separated by commas , password and user name;

2.3: The user exists on the prompt cannot be added, the user does not exist can not delete the user;

Vim admuser.sh Create a script file:

#!/bin/bash

Add=0 Add User variable switch

Del=0 Delete User variable switch

Debug=0 as a display execution process variable switch

#以下判断脚本后面的参数是否正确

For I in ' seq 1 $# '; Do

If [$#-gt 0];then

Case $ in

-v|--verbose)

Debug=1

Shift

;;

-H|--HELP)

echo "Usage: ' BaseName $-v|--verbose | -h|--help | -a|--add user1,user2 ...-d|--del user1,user2 ... "

Exit 0

;;

-a|--add)

Add=1

Addusers=$2

Shift 2

                     ;;

-d|--del)

Del=1

Delusers=$2

Shift 2

;;

*)

echo "Usage: ' BaseName $-v|--verbose | -h|--help | -a|--add user1,user2 ...-d|--del user1,user2 ... "

Exit 8

;;

Esac

Fi

Done

#以下判断增加用户

If [$ADD-eq 1]; Then

For USER in ' Echo ' $ADDUSERS | Sed ' s#,# #g '; Do remove to add user list

if! ID $USER &>/dev/null; Then determine if the user exists and does not exist add

Useradd $USER

echo $USER | passwd--stdin $USER &>/dev/null

[$DEBUG-eq 1] && echo "$USER add successfully"

Else

[$DEBUG-eq 1] && echo "$USER exist"

Fi

Done

Fi

#以下判断删除用户

If [$DEL-eq 1]; Then

For USER in ' Echo ' $DELUSERS | Sed ' s/,//g '; Do remove the list of users to delete

If ID $USER &>/dev/null; Then determine if the user exists, and then delete

Userdel-r $USER

[$DEBUG-eq 1] && echo "$USER del finished"

Else

[$DEBUG-eq 1] && echo "$USER no Exist"

Fi

Done

Fi

This article is from the "Xavier Willow" blog, please be sure to keep this source http://willow.blog.51cto.com/6574604/1764856

Linux Bash programming case statements and scripting (eight)