Linux shell scripting Exercises

One

#!/bin/bash
#自动添加用户, and make the initial password a user account name, and force the user to change the password when they log on
I=1
While [$i-le 15]
Do
If [$i-le 9]
Then
Useradd user0$i
echo "User0$i" | passwd--stdin user0$i &>/dev/null
chage-d 0 user0$i
Else
Useradd user$i
echo "User$i" | passwd--stdin user$i &>/dev/null
chage-d 0 user$i
Fi
# Userdel-r User$i

Let i++
Done

#!/bin/bash
#检测当前系统任一服务状态, start it if it is not started.
Read-p ' Input a service name: ' Ser
Service $ser Status &>/dev/null
If [$?-eq 0];
Then
echo "Service is running."
# elif [$?-eq 3];
# then service $ser start
Else
Service $ser Start

Fi

#!/bin/bash
#输出30至80之间的偶数及统计个数
G=0

For i in {30..80}
Do
yu= ' expr $i% 2 '

If [$yu-eq 0]
Then Echo-n ' $i ' && let g++
Fi
Done
Echo
echo "There is $g even totally."

#!/bin/bash
#阶乘运算
Read-p ' Input a number: ' num
Cj=1
For ((i=1;i<= $num; i++))
Do
Let Cj*=i
Done
Echo $CJ

#!/bin/bash
#生成九九乘法表
For ((i=1;i<=9;i++))
Do
For ((j=1;j<=i;j++))
Do
abc= ' expr $i \* $j '
Echo-n "$j * $i = $ABC"

Done

Echo
Done

#!/bin/bash
#备份MySQL日志
Dir=/var/lib/mysql
index= $dir/localhost-bin.index
I= ' Cat $index | Wc-l '
i=$ (($i-1))

if [!-e/logbackup]
Then Mkdir/logbackup
Fi

For log in ' head-$i $index | Awk-f '/' {print $} '
Do CP-NV $dir/$log/logbackup
Done

#!/bin/bash
#检测192.168.1.0/24 network segment and record IP address information that is not in line
net=192.168.1.
#for I in 1 2 3 4 5 6 7 8 9 10
#for i in ' seq 254 '
For I in {A.. Z
Do
Ping-c 3 $net $i &>/dev/null
If
[$?-eq 0]
Then
echo "$net $i is online!!!"
Else
echo "$net $i is offline!!!"
Fi
Done

This article is from the "Paundudo" blog, make sure to keep this source http://paundudo.blog.51cto.com/3741758/1538738