Shell Script Instance

1. Analog Linnux Login Shell

#/bin/bashecho-n "Login:" Read nameecho-n "password:" Read passwdif [$name = "CHT"-a $passwd = "abc"];thenecho "The Hos T and password is right! " else echo "Input is error!" Fi

2. Compare two number sizes

#/bin/bashecho "Please enter the number" read aread bif Test $a-eq $bthen echo "The" "No.2" elif test $a-gt $bthen echo " The > no.2 "Else echo" the very same < No.2 "fi

3. Find out if the file exists under the/root/directory

#/bin/bashecho "Enter a file name:" Read AIF test  -e/root/$athen echo "The file is exist!" else echo "The file is not exist!" Fi

Use of 4.for loops

#/bin/bashclearfor num in 1 2 3 4 5 6 7 8 9 10do    echo ' $num ' done

5. Command line Input

#/bin/bashecho "Please enter a User:" Read ab=$ (whoami) if test $a = $bthen echo "The user is running." else echo "The user is not running." Fi

6. Delete the file size 0 in the current directory

#/bin/bashfor filename in ' ls ' does    if test-d $filename then    b=0    Else          a=$ (ls-l $filename | awk ' {print $ } ')            if test $a-eq 0 then             rm $filename             fi        fi     done

7. If there is a file under/export/um_lpp_source, change its file system size to 3G

#/bin/bashwhile line= ' Ls/export/um_lpp_source ' do        if test $line = "then  echo" NULL "             sleep 1    else echo $line                chfs-a size=3g/export/um_lpp_source                 exit 0        Fidone

　　

8. Test the IP address

#/bin/bashfor i in  1 2 3 4 5 6 7 8 9do    echo "The number of $i computer is"    ping-c 1 192.168.0. $idone

9. If the size of the Test.log is greater than 0, then the *.tar.gz file in the/opt directory

#/bin/sha=2while name= "Test.log" Do        sleep 1        b=$ (ls-l $name | awk ' {print $} ')        if test $b-ge $a        #then Ech O "OK" then    ' cp/opt/*.tar.gz. '        exit 0        Fidone

10. Print the contents of the read, prepare for the following example

#/bin/bashwhile Read Namedoecho $namedone

11. Read content from 0.sh and print

#/bin/bashwhile Read Linedo    echo $linedone < 0.sh

12. Read the contents of the A.C and add 1 operations

#/bin/bashtest-e a.cwhile Read Linedo    a=$ (($line + 1)) Done < A.cecho $a

13. Ordinary parameterless function

#/bin/bashp () {    echo "Hello"}p

14. Passing parameters to a function

#/bin/bashp_num () {    num=$1    echo $num}for n in [email protected]do    p_num $ndone

15. Create a Folder

#/bin/bashwhile:d o    echo "Please input file ' s name:"    read a    if test-e/root/$a    then         echo "The file is Existing please input new file name: "    else        mkdir $a        echo" Aye sussesful! "        Break    Fidone

16. Get the native IP address

#/bin/bashifconfig | grep "inet Addr:" | awk ' {print $} ' | Sed ' s/addr://g '

17. Find the largest file

#/bin/basha=0for  name in *.*do     b=$ (ls-l $name | awk ' {print $} ')    if test $b-ge $a then    a= $b         Namemax = $name     Fidoneecho "The max file is $namemax"

18. Locate the IP user in the current segment and redirect to the Ip.txt file

#/bin/basha=1while:d o    a=$ (($a + 1))    if test $a-GT 255 then break    Else        echo $ (ping-c 1 192.168.0. $a | grep "TTL" | awk ' {print $4} ' | Sed ' s/://g ')        ip=$ (ping-c 1 192.168.0. $a | grep "TTL" | awk ' {print $4} ' | sed ' s/://g ')        echo $ip >> ip.tx T    Fidone

19. Print the current user

#/bin/bashecho "Current User is:" Echo $ (PS | grep "$$" | awk ' {print $} ')

20.case Statement Exercise

#!/bin/bashclearecho "Enter a number from 1 to 5: ' Read Numcase $num in    1 ' echo" you enter 1 "    ;;    2) echo "You enter 2"    ;;    3) echo "You enter 3"    ;;    4) echo "You enter 4"    ;;    5) echo "You enter 5"    ;;    *) echo "error"    ;; Esac

21.yes/no return to different structures

#!/bin/bashclearecho "Enter [y/n]:" Read acase $a in    y| y| yes| YES) echo "You enter $a"    ;;    n| N|no|no) echo "You enter $a"    ;;    *) echo "error"    ;; Esac

22. Killing process

#/bin/bashpid= ' Ps-ef | grep ' process-related content ' | Grep-v ' grep ' | awk ' {print $} ' if [-N ' $pid ']; Then        kill-9 $PIDFI

23. Use of built-in commands

#/bin/bash    Clear        echo "Hello, $USER"        echo               echo "Today's date id ' Date '"        echo        echo "The USER is: "        who        Echo        echo" This is ' uname-s ' "        echo        echo" That's all folks! "

24. Print user without password

#/bin/bashecho "No Password User is:" Echo $ (Cat/etc/shadow | grep "!!" | awk ' BEGIN {fs= ': '}{print $} ')

25. Check if the port number is started

#!/bin/bashn=1echo "Check XXX service ..." While Truedo        if test $n-gt and then                echo "XXX service failed to start" break        fi                       Sleep 5        n=$ (($n + 1))        port= ' netstat-antp | grep "0.0.0.0:8080" '        if [${#port}-gt 3]; then                Echo "XXX Service has been started" break                ;        Fidone

Original link: http://blog.163.com/hbu_lijian/blog/static/1261291532011113035622113/

　　

　　

　　

　　

　　

　　

　　

　

　　

　　

　　

Shell Script Instance