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Shell Scripts

The document contains several shell script examples for basic arithmetic operations, finding the greatest of three numbers, a menu-driven program for system tasks, and calculating the factorial of a number. Each script prompts the user for input and performs the specified operations, displaying the results accordingly. These examples illustrate fundamental scripting techniques in a Unix-like environment.

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14 views2 pages

Shell Scripts

The document contains several shell script examples for basic arithmetic operations, finding the greatest of three numbers, a menu-driven program for system tasks, and calculating the factorial of a number. Each script prompts the user for input and performs the specified operations, displaying the results accordingly. These examples illustrate fundamental scripting techniques in a Unix-like environment.

Uploaded by

wgfbwivbzlmktlz
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Shell scripts

1)

echo enter two numbers

read a b

echo "Addition: $(($a + $b))"

echo "Subtraction: $(($a - $b))"

echo "AMultiplication: $(($a * $b))"

echo "Quotient: $(($a / $b))"

echo "Remainder: $(($a % $b))"

or

echo enter two numbers

read a b

s=`expr $a + $b`

echo sum=$s

s=`expr $a - $b`

echo Difference =$s

s=`expr $a \* $b`

echo Product =$s

s=`expr $a / $b`

echo quotient =$s

s=`expr $a % $b`

echo Remainder =$s

2) Greatest of three numbers

echo Enter three numbers

read a b c

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

then

echo $a
elif [ $b -gt $c -a $b -gt $a ]

then

echo $b

else

echo $c

fi

3) Menu driven program

echo -e "MENU\n 1. List of files\n 2. Processes of User\n 3. Today's Date \n4. Users of system\n 5. quit"

echo " Enter your option "

read choice

case "$choice" in

1) ls -l ;;

2) ps -f ;;

3) date ;;

4) who ;;

5) exit ;;

*) echo "Invalid option"

esac

4) Factorial

echo "Enter a number"

read n

f=1

while [ $n -ne 0 ]

do

f=$(($f * $n))

n=$(($n -1))

done

echo "Factorial ="$f

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