UNIX and Shell Programming

UNIX and Shell Programming

Practical (506)

(Basic and Important Scripts)

1) Shell script to calculates the gross salary. (HRA = 20% of basic salary, DA = 50% of basic salary)

clear

echo -e "Enter basic salary:\c"

read bs

hra=`expr $bs \* 20 / 100`

da=`expr $bs \* 50 / 100`

gross=`expr $bs + $hra + $da`

echo "Gross salary is $gross"

Output:

Enter basic salary : 9000

Gross salary is 15300

2) Shell Script to Generate Fibonacci Series

if [ $# -eq 1 ]

then

num=$1

else

echo -n "Enter a Number :"

read num

a=0

b=1

echo "The Fibonacci sequence for the number $num is : "

for (( i=0;i<=num;i++ ))

echo -n "$a "

f=$((a+b))

a=$b

b=$f

done

Output:

Enter a Number :8

The Fibonacci sequence for the number 8 is :

0 1 1 2 3 5 8 13 21

3) Shell script to check whether the given number is prime or not.

clear

echo -e "Enter a number: \c"

read num

i=2

rem=1

if [ $num -lt $i ];

then

echo -e "$num is not a prime number.\n"

exit 0

while [ $i -le `expr $num / 2` -a $rem -ne 0 ];

rem=`expr $num % $i`

i=`expr $i + 1`

done

if [ $rem -ne 0 ];

then

echo -e "$num is a prime number.\n"

else

echo -e "$num is not a prime number.\n"

Output:

Enter a number: 17

17 is a prime number.

Enter a number: 10

10 is not a prime number.

4) Shell Script to Find Armstrong Numbers between a Range

echo -n "Enter the Lower Limit : "

read Start

echo -n "Enter the Upper Limit : "

read Ending

echo "Armstrong Numbers between $Start and $Ending are: "

while [ $Start -le $Ending ]

Number=$Start

Length=${#Number}

Sum=0

OldNumber=$Number

while [ $Number -ne 0 ]

Rem=$((Number%10))

Number=$((Number/10))

Power=$(echo "$Rem ^ $Length" | bc )

Sum=$((Sum+Power))

done

if [ $Sum -eq $OldNumber ]

then

echo -n "$OldNumber "

let Start++

done

Output:

Enter the Lower Limit : 100

Enter the Upper Limit : 400

Armstrong Numbers between 100 and 400 are: 153 370 371 407

5) Shell script to find the sum of digits of a number.

clear

echo -e "Enter number:\c"

read n

n1=$n

sum=0

r=0

while [ $n -gt 0 ]

r=`expr $n % 10`

sum=`expr $sum + $r`

n=`expr $n / 10`

done

echo -e "Sum of digits of number $n1 is $sum\n"

Output:

Enter number: 7890

Sum of digits of number 7890 is 24

6) Shell Script to find profit or loss given the Cost price and Selling price

clear

echo -e "Enter Cost Price:\c"

read cp

echo -e "Enter Selling Price:\c"

read sp

if [ $sp -eq $cp ];

then

echo -e "\nNo profit or loss has incurred.\n"

elif [ $sp -lt $cp ];

then

echo -e "\nLoss of Rs.`expr $cp - $sp` has incurred.\n"

else

echo -e "\nProfit of Rs.`expr $sp - $cp` has incurred.\n"

Output:

Enter Cost Price:1000

Enter Selling Price:1250

Profit of Rs.250 has incurred.

Enter Cost Price:300

Enter Selling Price:275

Loss of Rs.25 has incurred.

Enter Cost Price:280

Enter Selling Price:280

No profit or loss has incurred.

7) Shell script, which receives two filenames as arguments. It checks whether the two files contents are same or not. If they are same then second file is deleted.

if [ 2 –ne $# ];

then

echo “Usage: sh $0 filename1 filename2”

echo “For eg. sh $0 abc.txt xyz.txt”

if [ ! -e $1 ];

then

echo -e " $1 does not exist!\n"

exit 1

if [ ! -e $2 ];

then

echo -e " $2 does not exist!\n"

exit 1

if cmp $1 $2

then

echo "Both file’s content are same."

rm -f $2

if [ $? -eq 0 ];

then

echo -e "File $2 deleted successfully.\n"

else

echo -e "Error deleting file $2. Please check whether it is a

regular file or not.\n"

else

echo -e "Files $1 and $2 are different.\n"

Output:

$ sh filecmpdel.sh k.txt c.txt

k.txt does not exist!

$ sh filecmpdel.sh a.txt c.txt

a.txt c.txt differ: char 4, line 1

Files a.txt and c.txt are different.

$ sh filecmpdel.sh a.txt b.txt

Both file’s content are same.

File b.txt deleted successfully.

8) Write a program to find the factorial value of any number.

clear

echo -e "Enter a number:\c"

read num

fact=1

n=$num

while [ $num -ge 1 ]

fact=`expr $fact \* $num`

num=`expr $num - 1`

done

echo -e "Factorial of $n is $fact\n"

Output:

Enter a number:7

Factorial of 7 is 5040

9) Menu driven Shell script that Lists current directory, Prints Working Directory, displays Date and displays Users logged in

clear

chk=y

while [ "$chk" = "y" ]

echo -e "\nMENU:\n1. List Current Directory\n2. Date\n3.

Print Working Directory\n4. Users logged in

\nEnter your choice:\c"

read choice

case "$choice" in

1) ls ;;

2) date ;;

3) pwd ;;

4) who -Hu ;;

*) echo "Invalid Choice"

esac

echo -e "\nDo you want to continue? Enter y to continue

or any other key to quit:"

read chk

done

Output:

MENU:

1. List Current Directory

2. Date

3. Print Working Directory

4. Users logged in

Enter your choice:1

ap2.txt cost.sh f.txt res

ap5.sh.txt c.txt google-chrome-stable_current_i386.deb result

ap.sh.txt Desktop gross.sh sdf

asd.sh Documents hui Templates

a.sh Downloads makeshared test2.sh

ass.txt dsa.sh menu.sh test.sh

a.txt examples.deb Music Videos

calc.sh filecmp.sh Pictures

chk.sh file.sh prime.sh

cobi.sh fsct.sh Public

Do you want to continue? Enter y to continue or any other key to quit:

MENU:

1. List Current Directory

2. Date

3. Print Working Directory

4. Users logged in

Enter your choice:2

Sun Oct 2 12:45:21 IST 2011

Do you want to continue? Enter y to continue or any other key to quit:

MENU:

1. List Current Directory

2. Date

3. Print Working Directory

4. Users logged in

Enter your choice:3

/home/akash

Do you want to continue? Enter y to continue or any other key to quit:

MENU:

1. List Current Directory

2. Date

3. Print Working Directory

4. Users logged in

Enter your choice:4

NAME LINE TIME IDLE PID COMMENT

akash tty7 2011-10-02 09:12 old 1074 (:0)

akash pts/1 2011-10-02 09:18 . 1491 (:0.0)

Do you want to continue? Enter y to continue or any other key to quit:

10) Shell script to check executable rights for all files in the current directory, if a file does not have the execute permission then make it executable.

clear

s=0

x=0

for file in *.*;

s=`expr $s + 1`

if [ ! -x $file ];

then

if chmod u+x $file

then

echo "Added executable permission to $file"

x=`expr $x + 1`

else

echo "Error adding executable permission to $file"

done

echo -e "\nTotal number of files scanned: $s"

echo -e "Executable permission added to $x files.\n"

Output:

Added executable permission to examples.desktop

Added executable permission to google-chrome-stable_current_i386.deb

Added executable permission to menu.sh

Added executable permission to test2.sh

Added executable permission to test.sh

Total number of files scanned: 22

Executable permission added to 5 files.

11) Shell script for a simple calculator.

clear

echo "Enter number1:\c"

read n1

echo "Enter operator(+, -, /, *):\c"

read op

echo "Enter number2:\c"

read n2

if [ "$op" = "+" ];

then

calc=`echo $n1 + $n2|bc`

echo "\n$n1 + $n2 = $calc\n"

elif [ "$op" = "-" ];

then

calc=`echo $n1 - $n2|bc`

echo "\n$n1 - $n2 = $calc\n"

elif [ "$op" = "*" ];

then

calc=`echo $n1 \* $n2|bc`

echo "\n$n1 * $n2 = $calc\n"

elif [ "$op" = "/" ];

then

calc=`echo $n1 / $n2|bc`

echo "\n$n1 / $n2 = $calc\n"

else

echo "Invalid operator!\n"

Output:

Enter number1:100

Enter operator(+, -, /, *):+

Enter number2:50

100 + 50 = 150

Enter number1:90

Enter operator(+, -, /, *):*

Enter number2:5

90 * 5 = 450

12) Shell program to generate all combinations of 1, 2, and 3

clear

for i in 1 2 3

for j in 1 2 3

for k in 1 2 3

echo $i $j $k

done

Output:

1 1 1

1 1 2

1 1 3

1 2 1

1 2 2

1 2 3

1 3 1

1 3 2

1 3 3

2 1 1

2 1 2

2 1 3

2 2 1

2 2 2

2 2 3

2 3 1

2 3 2

2 3 3

3 1 1

3 1 2

3 1 3

3 2 1

3 2 2

3 2 3

3 3 1

3 3 2

3 3 3

13) Shell program for number sequence.

clear

if [ $# -ne 1 ];

then

n=4

else

n=$1

a=1

i=1

while [ $i -le $n ]

b=1

while [ $b -le $i ]

echo "$a \c"

a=`expr $a + 1`

b=`expr $b + 1`

done

echo "\n"

i=`expr $i + 1`

done

Output:

2 3

4 5 6

7 8 9 10

14) Decimal to Binary Conversion Shell Script

if [ $# -eq 0 ]

then

echo "Argument(s) not supplied "

echo "Usage: dec2binary.sh Decimal_number(s)"

else

echo -e "\033[1mDECIMAL \t\t BINARY\033[0m"

while [ $# -ne 0 ]

DecNum=$1

Binary=

Number=$DecNum

while [ $DecNum -ne 0 ]

Bit=$(expr $DecNum % 2)

Binary=$Bit$Binary

DecNum=$(expr $DecNum / 2)

done

echo -e "$Number \t\t $Binary"

shift

# Shifts command line arguments one step.Now $1 holds second argument

unset Binary

done

Output:

sh dec2binary.sh 7 16 255 256 1023 1024

DECIMAL BINARY

7 111

16 10000

255 11111111

256 100000000

1023 1111111111

1024 10000000000

15) Shell Script to Check Whether a String is Palindrome or not

if [ $# -eq 0 ]

then

echo -n "Enter a String: "

read pstr

else

pstr=$*

# Remove all punctuations from input string and convert upper case to

# lower or lower case to upper.

String="$(echo $pstr | sed 's/[^[:alnum:]]//g' | \

tr '[:upper:]' '[:lower:]')"

Flag=0

# Find length of the string.

len=${#String}

#You can also calculate string length using bellow commands.

#len=`echo $str | wc -c`

#len=$((len-1))

#get the mid value up to which the comparison would be done.

mid=$((len/2))

for ((i=1;i<=mid;i++))

c1=`echo $String|cut -c$i` # extracts from beginning

c2=`echo $String|cut -c$len` # extracts from last

if [ $c1 != $c2 ]

then

Flag=1

break 2 # break N breaks out of N levels of loop.

let len--

done

if [ $Flag -eq 0 ]

then

echo "\"$pstr\" is a Palindrome"

else

echo "\"$pstr\" is not a Palindrome"

Output:

sh palindrome1.sh Akash Shastri

"Akash Shastri" is not a Palindrome

sh palindrome.sh Dammit, I\'m mad!

"Dammit, I'm mad!" is a Palindrome

sh palindrome1.sh

Enter a String: 11/02/2011

"11/02/2011" is a Palindrome

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UNIX and Shell Programming

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