Unix Lab Cycle

1. Write a shell script to accept two numbers and perform all arithmetic operations on it.

echo “enter two numbers”read aread becho “To perform arithmetic operations enter y otherwise n”read swhile [ $s = y –o $s = Y ]doecho “Menu”echo “1.Addition”echo “2.Subtraction”echo “3.Multiplication”echo “4. Division”echo “5.Modulus”echo “6.Exit”echo “read your choice”read chcase $ch in1)add =`expr $a + $b’

echo “addition is :$add” ;;2) sub =`expr $a - $b’

echo “subtraction is :$sub” ;;3) mul =`expr $a \* $b’

echo “Multiplication is :$mul” ;;4)div =`expr $a / $b`

echo “Division is : $div”;;5) mod =`expr $a % $b`

echo “Modulus is : $mod”;;*)exit

echo “invalid choice”;;esacread sdone

2. Write a shell script to find the largest of three numbers using conditional execution operations.

echo “enter three numbers”read a read bread c

if [ $a -gt $b ]thenif [ $a -gt $c ]then

Echo “ $a is big”else

echo “ $c is big”fielseif [ $b –gt $c ]thenecho “$b is big “else

echo “$c is big “fifi

3. Write a shell script to check whether a particular user has logged in or not. If he has logged in, also check whether he has eligibility to receive message or not.

echo “enter login name”read st=`who | gerp $s`if test “$t”thenecho “person is login”elseecho “Not login”fip=`mesg | cut –d “ “ –f2`echo “$p”if [ “$p” = “y” ]then

echo “able to receive message”else

echo “not able to receive message”fi

4. Write a shell script to accept the name of the file from standard input and perform the following tests on it.a) File executableb) File readablec) File writeabled) Both readable and writeable.

echo “enter file name”read fecho “do you want to perform operations”read swhile [ $s = y -o $s = Y ]doecho “Menu”echo “1. File executable”echo “2. File read able”echo “3. File writeable”echo “4. Both readable and writeable”echo “enter ur choice”read chcase $ch in 1) if test -x $f

thenecho “file is executable”elseecho “ file is not executable”fi;;

2) if test -r $fthen

echo “file is readable”else

echo “file is not readable “fi;;

3) if test - w $fthenecho “ file is writeable “elseecho “ file is not writeable”fi

;;4) if test -r $f -a -w $f

thenecho “ file is readable and writeable “

elseecho “ not readable and writeable”

fi;;*) exit ;;esacecho “do you want to continue”read wish

if [ $wish = y –o $wish = Y ]thencontinueelseexitfidone

5. Write a shell script which will display the username and terminal name who login recently in the unix system.

echo “user name is :”who | tr –s “ “ | cut -d “ “ -f 1echo “terminal name is :”who | tr -s “ “ | cut -d “ “ –f 2

6. Write a shell script to find no of file in a directory

echo “enter a directory name”read sif test -d $sthen

d =`ls $s | wc -l `echo “No of files are : $d”else

echo “Not a directory”fi

7. Write a shell script to print the following format11 21 2 31 2 3 4

echo “enter a number”read ni =1j =1while [ $i -le $n ]doj =1while [ $j -le $i ]doecho -n “$j”

j =`expr $j + 1`doneecho “ “i =`expr $i + 1`done

8. Write a shell script to print pime numbers up to a given range using arguments.

echo “enter lower and upper limt”if test $# -lt 2thenecho “insufficient arguments”elsel = $1u = $2while [ $l -le $u ]doi =1c =0while [ $i -le $l ]dom=`expr $l % $i `if [ $m –eq 0 ]thenc=`expr $c + 1 `fii = `expr $i + 1`doneif [ $c –eq 2 ]thenecho “ prime number is : $l”fil =`expr $l + 1`done fi

9. Write a shell script which will display the number of days in the given month and year.

echo “enter month”read mecho “enter year”read ycase $m in1) echo “January “

echo “days are :31”;;2) echo “feb”

if [ `expr $y % 4 -eq 0 ]thenecho “days are: 29”elseecho “days are : 28”fi;;

3) echo “March”echo “ days are :31”;;

4 ) echo “April”echo “days are: 30”;;

5) echo “May”echo “ days are : 31”;;

6) echo “June”echo “days are: 30”;;

7) echo “July”echo “ days are: 31”;;

8) echo “August”echo “ days are: 31”;;

9) echo “Sep”echo “days are: 30”;;

10) echo” Oct”echo “ days are : 31”;;

11) echo “Nov”echo “days are: 30”;;

12 ) echo “Dec”echo “ Days are: 31”;;

*) echo “invalid choice”;;esac

10. Write a shell script to check whether a given number is perfect or not.

echo “enter a number”read ni =1s =0m = $nwhile [ $i -lt $n ]dox =`expr $n % $i`if [ $x –eq 0]

thens = `expr $s + $i `fii = `expr $i + 1`doneif [ $s –eq $m]thenecho “given no is perfect”elseecho “given number is not perfect”

11. Write a shell script to copy, rename, edit and delete a file.

echo “do you want to perform operations:”read swhile [ $s = y –o $s = Y ]doecho “enter a file”read fecho “Menu”echo “1. Copy”echo “2. Edit”echo “3. Rename”echo “4.Delete”echo “5.Exit”echo “enter ur choice”read chcase $ch in1) echo “enter another file to copy:”

read f1cp $f $f1echo “file is copied”;;

2) echo “ enter file name to which data is appended”cat >> $fecho “after editing”cat $f;;

3) echo “ Rename the file”read f1mv $f $f1echo “file moved”;;

4) rm $fecho “ file is deleted”;;

*) echo “invalid choice”;;esacecho “ Do u want to continue”read aif [ $a = y –o $a = Y ]thencontinueelse exitfidone

12. Write a shell script for concatenation of two strings”

echo “enter two strings”read sread s1echo “concatenation is : $s $s1”

13. Write a shell script which will display Fibonacci series up to a given number of arguments.

If test $# -lt 1thenecho “insufficient arguments”elsen= $1count=0f1=0f2=1echo “series is :”echo “$f1”echo “$f2”while [ $count –le $n ]dof=`expr $f1 + $f2`f1= $f2f2= $fecho “$f”count=`expr $count + 1`done fi

14. Write a shell script to accept student number ,name , marks in 5 subjects . Find total , average and grade. Display the result of student and store in a file called stu.dat Rules are:Avg >=80 then grade AAvg <80 && avg >=70 then grade BAvg <70 && avg >=60 then grade CAvg <60 && avg>=50 then grade DAvg <50 && avg >=40 then grade EElse grade F

echo “Do you want to enter student data”read awhile [ $a = y -o $a = Y ]doecho “enter number”read snoecho “enter name”read nameecho “enter 5 dubject marks”read m1read m2read m3read m4read m5total = `expr $m1 + $m2 + $m3 + $m4 + $m5`echo “total is $total”avg = `expr $total / 5`echo “average is $avg”if [ $avg –ge 80 ]thengrade = “A”elif [ $avg –lt 80 -a $avg -ge 70 ]thengrade = “B”elif [ $avg -lt 70 -a $avg -ge 60 ]thengrade = “C”elif [ $avg -lt 60 -a $avg -ge 50 ]thengrade = “D”elif [ $avg -lt 50 –a $avg –ge 40 ]thengrade = “E”elsegrade = “F”fi

echo “enter filename”read fecho “ $sno $name $total $avg $grade >> $fecho “Do you want to continue”read adone

First create the file with name stu.dat in the folloeing format.

cat > stu.datStudent InformationSNO NAME TOTAL AVERAGE GRADE

Press ctrl –d

15. Write a shell script to accept empno, empname, basic. Find DA, HRA, TA, PF, GROSS SAL and NETSAL. Also store all details in a file called emp.dat The rules are: HRA is 18% of basic if basic >5000 otherwise 550.

DA is 35% of basic.PF is 13% of basicIT is 14 % of basicTA is 10% of basic.

echo “Do you want to enter employee data”read awhile [ $a = y -o $a = Y ]doecho “enter employee number”read snoecho “enter employee name”read nameecho “enter basic salry”read bsalif [ $bsal -gt 5000 ]thenk =`expr 18 \* $bsal`hra=`expr $k / 100`elsehra=550fik = `expr 15 \* $bsal`da= `expr $k / 100`k = `expr 13 \* $bsal`pf = `expr $k /100`

k =`expr 10 \* $bsal`ta=`expr $k / 100`k=`expr 14 \* $bsal`it = `expr $k \ 100`gsal = `expr $hra + $da + $ta + $it + $bsal + $pf’nsal= `expr $gsal - $pf - $it`echo “enter file name”read fecho “EMPLOYEE DETAILS ARE:”>> $fecho “ EMPNO is: $sno >> $fecho “EMPLOYEE NAME IS: $name “>> $fecho “ BASIC SALARY IS: $bsal “ >>$fecho “ GROSS SALARY IS : $gsal “>> $fecho “ NETSALARY IS: $nsal “>>$fecho “Do you want to continue”read adone

16. Write a shell Script to demonstrate break and continue statements.

echo “Testing for break”i= 1while [ $i -le 10 ]doecho “ $i”i=`expr $i + 1`if [ $i –eq 5 ]thenbreakfidoneecho “ testing for continue”i=0while [ $i –le 10 ]doi=`expr $i + 1`if [ $i –eq 5 ]then continuefiecho “ $i”done

17. Write a shell script to satisfy the following menu optiions.

a) Dislpay current directory pathb) Display todays datec) Display users who are connected to the unix systemd) Quit

echo “enter ur choice”echo “MENU”echo “1.PATH”echo “2. DATE”echo “3.WHO”echo “4.QUIT”read chcase $ch in1) echo “ Current directory is “

pwd;;2) echo “Cureent date is :”

date;;3) echo “Users connected to unix system is:”

who ;;4) exit;;esac

18. Write a shell script to delete all files whose size is zero bytes from current directory.

echo “enter a directory name”read aif test -d $athen

echo “it is directory”cd $aecho “before deleting the files are:”

ls -lfor k in `ls -l | tr –s “ “ | cut -d “ “ -f 5,9 |grep 0 | cut -d “ “ -f 2`dorm $kecho “Deletion is done and remaining files are:”ls -ldoneelseecho “$d is not directory”fi

19. Write a shell script to display string palindrome from given argumnets.

if $# -lt 1thenecho “Insufficeint argumnets”exit ficount =`echo $1 | wc -c`input = $1while [ $count -gt 0 ]dovar =`echo $1 | cut –c $count `count = `expr $count - 1`temp= `echo $temp$var`doneif [ $input = $temp ]thenecho “String is palindrome”elseecho “not palindrome”fi

20. Write a shell script which will display armstrong numbers from given argument.

if test $# -lt 1thenecho “Insufficient arguments”elsei= $1n= $2while [ $i -le $n ]dos=0m=$iwhile [ $i –gt 0]dor=`expr $i % 10`d=`expr $r \* $r \* $r`s=`expr $s + $d`i=`expr $i / 10`doneif [ $i –eq $m ]thenecho “given number is armstrong $m “fii=`expr $i + 1`

donefi

21. Write a shell script to display a revere of a number from given arguments.

if test $# -lt 1thenecho “Insufficient arguments”elsen= $1s=0while [ $n -gt 0]don=`expr $n % 10`s=`expr $s \* 10 + $m`n=`expr $n / 10`doneecho “reverse number is : $s”fi

22. Write a shell script to display factorial value from given argument list.

if test $# -lt 1thenecho “Insufficient arguments”elsen= $1i=1f=1while [ $i -le $n ]dof=`expr $f \* $i`i=`expr $i + 1`doneecho “fact is $f”fi

23. Write a shell script which will find maximum file size in the given argumnet list.

max =0for k in `ls -l | tr -s “ “ | cut -d “ “ -f 5`do

if [ $ k -gt $max ]thenmax = $kelsemax= $maxfidonefile= `ls -l | grep $max | tr -s “ “ | cut -d “ “ -f 9`echo “the file $file is having amximum size $max”

24. Write a shell script which will greet you “Good Morning” , “ Good Afternoon “, “Good Evening “ and “Good Night” according to current time.

t = `Date +%H`if [ $t -lt 12 ]thenecho “Good Morning”elif [ $t -le 16 ]thenecho “Good Afternoon”elif [ $t -lt 20]thenecho “Good Evening “elseecho “Good Night”

25. Write a shell script which will display total size of directories.

echo “enter a directory”read sif test -d $sthenls -l $s | head -1elseecho “It is not directory”fi

26. Write a shell script to sort the elements in an array using bubble sort technique.

echo “enter size:”read necho “enter elements”i=0while [ $i -le $n ]do

read pa[$i] = $pi=`expr $i + 1`donej=0while [ $j -le `expr $n - 1` ]dok=0while [ $k -le `expr $n - $j -1` ]doif [ ${a[ $k]} -gt ${a[ $k + 1]} ]thent= $ { a[ $k] }a[ $k ] =${a[ $k + 1] }a[ $k + 1] =$tfik=`expr $k + 1`donej=`expr $j + 1`donel=0echo “elements after sorting”while [ $l -le $n ]doecho –n –e ${a[$l]} “\t”l=`expr $l + 1`doneecho “ “

27. Write a shell script to find largest element in an array.

echo “enter size:”read necho “enter elements”i=0while [ $i -le $n ]doread pa[$i] = $pi=`expr $i + 1`dones= ${a[ $i]}while [ $i -le $n]doj=`expr $i + 1`if [ $s –lt ${a[$j]} ]

thens=${a[ $i]}fii=`expr $i + 1`doneecho “largest element is $s”

28. Write an awk program for display the lines in any file center alignment.

echo “enter file name”read fcat $f | awk ‘ {

for (k=1;k<35;k++)printf “%s” , “ “print $0 }’

29. Write an awk program to print sum ,avg of student marks list

echo “ Enter file name”read fawk -F “ “ ‘ {

print $1, $2, $3 ,$4} ‘ $f

30. Write an awk program to display total number of users and their names in unix system.

echo “to count no of users and their names”who | wc -l | awk ‘ { print “No of users are:” , NF}who | awk ‘ { print “ Names of users are : “ , $1}

31. Write an awk program to display student pass/fail report.

echo “ Enter file name”read fawk -F “ “ ‘ {

print $1, $2 ,$5} ‘ $f

32. Write an awk program to count no of vowels in agiven file.

awk ‘ BEGIN {

String=”this is unix lab”Search = “ “

s1 = “aeiou”n = split(String, a,search);n1=split(s1,b,search);for (i =1;i<=n;i++){

printf(“word [ %d]= %s\t”, i ,a[i]);}for (i =1;i<=n;i++){

printf(“words [ %d]= %s\t”, i ,a[i]);}v=0;for (i =1;i<=n;i++){

for (j =1;j<=n;j++){

if (a[i]==b[j]){

v= v+1;}

}}

printf( “no of vowels are %d” , v);exit;}’

33. Write an awk program which will find maximum word and its length in the given input file.

awk ‘ BEGIN {

String=”this is unix lab”Search = “ “n = split(String, a,search);for (i =1;i<=n;i++){

printf(“word [ %d]= %s\t”, i ,a[i]);}for (i=1;i<=n;i++){

m=length(a[i[);for (j=i+1;j<=n;j++){

p=length(a[j]);

if (m>p){

max=m;k=a[i];

}else{

max=p;k=a[j];

}}

}printf(“the maximum word in a file is %s “ “and having length %d \n “ ,k , max);

exit;}’

34. Write a shell script to generate mathmatical table

echo “enter a number”read ni=1;while [ $i –le 10 ]dob=`expr $n \* $i`echo “$a \* $i = $b”i=`expr $i + 1`done

35. Write a shell script to check whether a given number is strong or not.

echo “enter anumber”read ns=0;m= $nwhile [ $n –gt 0 ]doi=1f=1d=`expr $n % 10`while [ $i -le $d ]dof=`expr $f \* $i`i=`expr $i + 1`dones=`expr $s + $f`

n=`expr $n / 10`doneif [ $m -eq $s ]thenecho “ given number is strong “elseecho “not strong”fi

36. Write a shell script to sort elements in an array using selection sort.

echo “enter size:”read necho “enter elements”i=0while [ $i -le $n ]doread pa[$i] = $pi=`expr $i + 1`donej=0while [ $j -lt $n ]dok=`expr $j + 1`while [ $k -lt $n ]doif [ ${a[$k] } -lt ${a[ $j]} ]thent=${a[$k]}a[$k]= ${a[$j]}a[$j]=$tfik=`expr $k + 1`donej=`expr $j + 1`done s=0echo “enter elements after sorting”while [ $s –lt $n ]doecho -n -e ${a[$s]} “\t”s=`expr $s + 1`done

37. Write a shell script to search a given number using binary search.

echo “enter size:”read necho “enter elements”i=0while [ $i -le $n ]doread pa[$i] = $pi=`expr $i + 1`donej=0while [ $j -lt $n ]dok=`expr $s – 1`while [ $k –lt $s]doif [ ${a[$k]} -lt ${a[$j]} ]thent=${a[$k]}a[$k]= ${a[$j]}a[$j]=$tfik=`expr $k + 1`donej=`expr $j + 1`done echo “enter element to search”read eh=0l= $swhile [ $h –le $l ]domid =`expr $l + $h`mid1=`expr $mid / 2`if [ $e -lt ${a[$mid1]} ]thenl = $mid1elif [ $e -gt ${a[$mid1]} ]thenh=$mid1elseecho “found at $mid1”

breakfidone

38. Write a shell script to find no of vowels, consonants, numbers, white spaces and special characters in a given string.

echo “ enter file name”read fecho “enter string in file”cat >$fn=`wc –c $f | cut -d “ “ -f 1`i =1while [ $i -le $n ]doa[ $i]= `cut -c $i $f`i=`expr $i + 1`donevc=0wc=0nc=0sc=0cc=0k=1while [ $k - le $n ]dou=${a[$k]}case $u in

[a-z]) if [ “$u” = “a” –o “$u” = “e” -o “$u” = “i” -o “$u” = “o” -o “$u” = “u” ]then

vc =`expr $vc + 1`else

cc=`expr $cc + 1`fi;;[0-9] ) nc =`expr $nc + 1`;;*) if test –z $u

thenwc=`expr $wc + 1`elsesc=`expr $sc + 1`fi;;

esac

echo “ No of vowels are : $vc”echo “No of consonants are : $cc”echo “No of white spaces are: $wc “echo “ No of special symbols are: $sc”echo “No of digits are : $nc”

39. Write a shell script to lock the terminal.

Clearecho “enter password”stty –echo read p1stty echo echo “confirm password”stty -echoread p2stty echoif [ “ $p1” != “$p2” ]thenecho “wrong password”exitficlear echo “screen locked”echo “ to open the lock enter a password”stty -echoread p3sty echowhile [ “$p3” != “$p1” ]doecho “wrong password”echo “enter password again”stty -echoread p3stty echodoneclearecho “screen is unlocked”exit

40. Write a shell script which merge the contents of file1, file, file3 sort them and display the sorted output on the screen page by page.

echo “enter file names”

read f1read f2read f3echo “the merged file is:”read f4cat $f1 $f2 $f3 >> $f4more -c $f1 $f2 $f3