Shell Script Learning Case List

chmod u+x

./shxx

1. Simple Shell Programming SH example execution

Display the directory and file in which you are located

$cat Example

#!/bin/sh

#this is to show what a example looks like

echo "Our first example"

Echo # this

echo "We Are"

/bin/pwd

Echo

echo "This directory contains the following file"

/bin/ls

2. Write a weekly diary of the statistics disk, the user has

SH sysunfo

#!/bin/sh

#auto Mail for system info

/bin/date +%f >>/tmp/sysinfo

echo "Disk info:->>/tmp/sysinfo

/bin/df-h >>/tmp/sysinfo

Echo >>/tmp/sysinfo

echo "Online users:->>/tmp/sysinfo

/usr/bin/who | /bin/grep-v Root >>/tmp/sysinfo

Echo >>/tmp/sysinfo

echo "Momory info:->>/tmp/sysinfo

/usr/bin/free-m >>/tmp/sysinfo

Echo >>/tmp/sysinfo

#wirte Root

/usr/bin/write Root </tmp/sysinfo &&/bin/rm/tmp/sysinfo

# CRONTAB-E

#0 9 * * 1-5 Script

3. Scripts for automating backups

The position variable is represented

SH autoback

#!/bin/sh

#backup Fies by date

Date= '/bin/date +%y%m%d '

/bin/tar-cf/backup/$1. $DEATE. Tar $ >/dev/null 2>>/backup/$1.back.log

/bin/gzip/backup/$1. $DATE. Tar

If[$?-eq 0]

Then

echo "$s 1 $DATE backup successfuly" >>/backup/$1.back.log

Else

echo "$ERROR: Falure $ $DATE back!" >>/backup/$1.back.log

Fi

#crontab-E

# 0 3 * * 2,5 Acript

Using meta-algorithm for 4.EXPR variables

SH expr

#!/bin/sh

a=10

B=20

C=30

value1= ' expr $a + $b + $c '

echo "The value of Vaule2 is value2"

vaule2= ' expr $c/$b '

echo "The value of Vaule2 is value2"

value3= ' expr $a + $c/$b '

echo "The value of value 4 is $value 4"

The value of the 5.test character judgment (detection service in the server has the boot, does not start the boot)

Cat Test.apache

#!/bin/sh

# if....esle "Usage

# using this program to show your system ' s services.

echo "Now, the Web service of this Linux system would be detect ..."

Echo

# Detect WWW Service

web= '/usr/bin/pgrep httpd '

If {"$web" = ""}

Then

echo "The Web service is running."

Else

echo "The Web service is not running."

/ETC/RC.D/INIT.D/HTTPD start

Fi

6. Keyboard input Read the user group, Management group and other information examples./userinfo root

Cat userinfo.sh

#!/bin/sh

#display user ' s inof ...

/bin/echo "Please input the username"

Read username

/bin/grep $username/etc/passwd >/dev/null 2>/dev/null

If {$?-eq 0}

Then

/bin/echo "username is: $username"

Else

/bin/echo "User $username does not exist"

Exit 1

Fi

/bin/echo

# LIST/ETC/PASSWD Info

userinfo= '/bin/grep ' $username: x/etc/passwd '

Userid= '/bin/echo $userinfo | /bin/awk-f: ' {print $} '

Groupid= '/bin/echo $userinfo | /bin/awk-f: ' {print $4} '

Homedir= '/bin/echo $userinfo | /bin/awk-f: ' {print $6} '

Shell= '/bin/echo $userinfo | /bin/awk-f: ' {print $7} '

#get Group name from GID

Grouptmpname= ' Cat/etc/group | /bin/grep:x: $groupid '

Groupname= '/bin/echo $grouptmpname | /bin/awk-f: ' {print '} '

/bin/echo "User ID is: $userid"

/bin/echo "Default group is: $grouptmpname"

/bin/echo "Shell is: $shell"

/bin/echo "group Nembers info:"

# Get Login Info

Userlogin= '/user/bin/who | /bin/grep $ Username '

/bin/echo

# Get Login Info

Userlogin= '/usr/bin/groups $ Username '

If ["$userlogin"! = ""]

Then

/bin/echo/"username is online"

Else

/bin/echo/"username not logged in"

Fi

7. Kick the user

Instance SH killuser.sh Test

Cat killuser.sh

#!/bin/sh

# The script to kill logined user.

Username= "$"

/bin/ps aux | /bin/grep $username | /bin/awk ' {print $} ' >/tmp/temp.pid

Killid = ' Cat/tmp/temp.pid '

For-PID in $killid

Do

/bin/kill-9 $PID 2>/dev/null

Done

8. Batch Add Users

Cat useradd.sh

#!/bin/sh

#Authur: Sam < e-mail: [Email protected]>

# The script to add user

#/etc/passwd Info

echo "Pleass input Username:"

Read name

echo "Pleass input number:"

Read num

N=1

While [$n-le $num]

Do

/usr/sbin/useradd $name $n

n= ' Expr $n +1 '

Done

#/etc/shadow Info

echo "Pleass input the password:"

Read passwd

M=1

While [$m-le $num]

Do

echo $passwd | /USR/BIN/PASSWD--stdin $name $m >/dev/null

m= ' expr $m + 1 '

Done

9. Delete a user

Cat deluser.sh

#!/bin/sh

echo "Please input username:"

Read name

echo "Please input number:"

Read num

Sum =0

While [$sum-lt $sum]

Do

sum= ' Expr $sum +1 '

/usr/sbin/userdel-r $name $sum

Done

10. Compare the view changes of the command

Cat setuid.sh

#!/bin/sh

# After the system installed,please check Setudi files first for secrity

# Mkdir/backup

#find/perm-4000-o-perm-2000 >/backup/setuid.list

/usr/bin/find/-perm-4000-o-perm-2000 >/tmp/setuid.check 2>/dev/null

For file in '/bin/cat/tmp/setuid.check '

Do

/bin/grep $file/backup/setuid.list >dev/null

If ["$?"! = "0"]

Then

echo "$file isn ' t in list! It ' s danger!! "

Fi

Done

/bin/rm/tmp/setuid.check

Shell Script Learning case List