Basic Shell Programs
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This document contains 5 shell script examples: 1. A script that performs basic mathematical operations like addition, subtraction, multiplication, and division on two numbers. 2. A script that swaps the values of two numbers using a temporary variable. 3. A script that swaps two numbers without using a temporary variable. 4. A script that determines whether a given number is even or odd. 5. An assignment to write a script that calculates percentage from marks of 5 subjects and assigns a grade based on percentage ranges.
![#!/bin/sh
# This script performs basic mathematical operations
echo "Enter the first number: "
read num1
echo "Enter the second number: "
read num2
# Addition
add=$((num1 + num2))
echo "The sum of $num1 and $num2 is $add.“
# Subtraction
sub=$((num1 - num2))
echo "The difference of $num1 and $num2 is $sub."
# Multiplication
mul=$((num1 * num2))
echo "The product of $num1 and $num2 is
$mul."
# Division
if [ $num2 -ne 0 ]
then
div=$((num1 / num2))
echo "The quotient of $num1 and $num2
is $div."
else
echo "Cannot divide by zero."
fi
Linux
Laboratory
-
B.Tech.
6th
CSE
-
Dr.
D.
P.
Mishra,
BIT
Durg
5.1- Shell Script for performing basic
mathematical operations](https://image.slidesharecdn.com/linuxlab5-230419181500-94eea483/85/Basic-Shell-Programs-2-320.jpg)
![5.4- Shell Script for determining whether
number is even or odd
Linux
Laboratory
-
B.Tech.
6th
CSE
-
Dr.
D.
P.
Mishra,
BIT
Durg
#!/bin/sh
# This script determines whether a number is even or odd
echo "Enter a number: "
read num
if [ $((num % 2)) -eq 0 ]
then
echo "$num is even."
else
echo "$num is odd."
fi](https://image.slidesharecdn.com/linuxlab5-230419181500-94eea483/85/Basic-Shell-Programs-5-320.jpg)
Basic Shell Programs
- 1. Dr. D. P. Mishra Digitally signed by Dr. D. P. Mishra DN: cn=Dr. D. P. Mishra, o=durg, ou=BIT, email=dpmishra@bitdurg. ac.in, c=IN Date: 2023.03.13 12:39:50 +05'30'
- 2. #!/bin/sh # This script performs basic mathematical operations echo "Enter the first number: " read num1 echo "Enter the second number: " read num2 # Addition add=$((num1 + num2)) echo "The sum of $num1 and $num2 is $add.“ # Subtraction sub=$((num1 - num2)) echo "The difference of $num1 and $num2 is $sub." # Multiplication mul=$((num1 * num2)) echo "The product of $num1 and $num2 is $mul." # Division if [ $num2 -ne 0 ] then div=$((num1 / num2)) echo "The quotient of $num1 and $num2 is $div." else echo "Cannot divide by zero." fi Linux Laboratory - B.Tech. 6th CSE - Dr. D. P. Mishra, BIT Durg 5.1- Shell Script for performing basic mathematical operations
- 3. #!/bin/sh # This script swaps the values of two numbers using a temporary variable echo "Enter the first number: " read num1 echo "Enter the second number: " read num2 echo "Before swapping, num1 is $num1 and num2 is $num2." # Swap the values of num1 and num2 using a temporary variable temp=$num1 num1=$num2 num2=$temp echo "After swapping, num1 is $num1 and num2 is $num2." Linux Laboratory - B.Tech. 6th CSE - Dr. D. P. Mishra, BIT Durg 5.2- Shell Script for Swapping values of two numbers using temporary variables
- 4. #!/bin/sh # This script swaps two numbers without using a temporary variable echo "Enter the first number: " read num1 echo "Enter the second number: " read num2 echo "Before swapping, num1 is $num1 and num2 is $num2." # Swap the values of num1 and num2 without a temporary variable num1=$((num1 + num2)) num2=$((num1 - num2)) num1=$((num1 - num2)) echo "After swapping, num1 is $num1 and num2 is $num2." Linux Laboratory - B.Tech. 6th CSE - Dr. D. P. Mishra, BIT Durg 5.3- Shell Script to swap two numbers without Temporary Variables
- 5. 5.4- Shell Script for determining whether number is even or odd Linux Laboratory - B.Tech. 6th CSE - Dr. D. P. Mishra, BIT Durg #!/bin/sh # This script determines whether a number is even or odd echo "Enter a number: " read num if [ $((num % 2)) -eq 0 ] then echo "$num is even." else echo "$num is odd." fi
- 6. 5.5:Task/Assignment • Write a shell script to input marks of five subjects Physics, Chemistry, Biology, Mathematics and Computer. Calculate percentage and grade according to following logic: • Percentage >= 90% : Grade A, • Percentage >= 80% : Grade B, • Percentage >= 70% : Grade C, • Percentage >=60% . Grade D, • Percentage >= 40% : Grade E, • Percentage < 40% : Grade F. Linux Laboratory - B.Tech. 6th CSE - Dr. D. P. Mishra, BIT Durg