bash - Write a shell script to find the largest among three numbers. Get user inputs and display the result

Bash - Write a shell script to find the largest among three numbers. Get user inputs and display the result

To write a shell script that finds the largest among three numbers, where the numbers are provided by the user as inputs, you can follow these steps:

  1. Prompt the User for Input: Use read to get input from the user for each of the three numbers.

  2. Compare the Numbers: Use conditional statements (if, elif, else) to compare the numbers and determine the largest one.

  3. Display the Result: Output the largest number to the user.

Here's a sample shell script (largest_number.sh) to accomplish this:

#!/bin/bash # Prompt user for input echo "Enter three numbers:" read -p "Number 1: " num1 read -p "Number 2: " num2 read -p "Number 3: " num3 # Initialize a variable to store the largest number largest=$num1 # Compare num2 with largest if [ $num2 -gt $largest ]; then largest=$num2 fi # Compare num3 with largest if [ $num3 -gt $largest ]; then largest=$num3 fi # Display the result echo "The largest number among $num1, $num2, and $num3 is: $largest"

Explanation:

  • Input Collection:

    • Uses read command to prompt the user for input three times (num1, num2, num3).

  • Comparison Logic:

    • Initializes largest with the value of num1.
    • Checks if num2 is greater than largest and updates largest if true.
    • Checks if num3 is greater than largest and updates largest if true.

  • Output:

    • Uses echo to display the largest number among the three entered numbers.

Example Usage:

Assume you save the script as largest_number.sh and make it executable (chmod +x largest_number.sh), you can run it as follows:

$ ./largest_number.sh Enter three numbers: Number 1: 25 Number 2: 12 Number 3: 30 The largest number among 25, 12, and 30 is: 30

In this example, the script prompts for three numbers (25, 12, and 30), and it correctly identifies 30 as the largest number among them.

This script handles integer comparisons directly. For floating-point comparisons or more complex input validations, additional considerations might be necessary. Adjust the script according to your specific requirements and use cases.

Examples

  1. Bash script find largest of three numbers

    • Description: Script to determine the largest among three numbers entered by the user in Bash.
    • Code:
      #!/bin/bash # Prompt user for three numbers echo "Enter three numbers:" read num1 num2 num3 # Find the largest number if [ $num1 -gt $num2 ] && [ $num1 -gt $num3 ]; then largest=$num1 elif [ $num2 -gt $num1 ] && [ $num2 -gt $num3 ]; then largest=$num2 else largest=$num3 fi # Display the largest number echo "The largest number is: $largest"
    • This script prompts the user to enter three numbers, compares them, and prints the largest number among them.

  2. Bash script to find maximum of three integers

    • Description: Writing a Bash script to find the maximum value among three integer inputs.
    • Code:
      #!/bin/bash # Function to find maximum of three numbers max_of_three() { if [ $1 -ge $2 ] && [ $1 -ge $3 ]; then echo $1 elif [ $2 -ge $1 ] && [ $2 -ge $3 ]; then echo $2 else echo $3 fi } # Prompt user for input echo "Enter three integers:" read num1 num2 num3 # Call function and display result result=$(max_of_three $num1 $num2 $num3) echo "The maximum number is: $result"
    • This script defines a function max_of_three to find the maximum of three numbers entered by the user and prints the result.

  3. Bash script largest number among three user inputs

    • Description: Script to determine the largest number among three inputs provided by the user in Bash.
    • Code:
      #!/bin/bash # Prompt user for input echo "Enter three numbers:" read num1 num2 num3 # Compare numbers and find the largest if ((num1 > num2 && num1 > num3)); then largest=$num1 elif ((num2 > num1 && num2 > num3)); then largest=$num2 else largest=$num3 fi # Display the largest number echo "The largest number is: $largest"
    • This script uses arithmetic comparison to determine the largest number among three inputs provided by the user.

  4. Bash script to find largest number using conditional statements

    • Description: Writing a Bash script to find the largest number among three inputs using conditional statements.
    • Code:
      #!/bin/bash # Prompt user for input echo "Enter three numbers:" read num1 num2 num3 # Initialize variable for storing largest number largest=$num1 # Compare with second number if [ $num2 -gt $largest ]; then largest=$num2 fi # Compare with third number if [ $num3 -gt $largest ]; then largest=$num3 fi # Display the largest number echo "The largest number is: $largest"
    • This script sequentially compares each number entered by the user to determine and display the largest number.

  5. Bash script to find maximum value among three integers

    • Description: Implementing a Bash script to find the maximum value among three integers provided as input.
    • Code:
      #!/bin/bash # Prompt user for input echo "Enter three integers:" read num1 num2 num3 # Use conditional checks to find maximum if [[ $num1 -ge $num2 && $num1 -ge $num3 ]]; then max=$num1 elif [[ $num2 -ge $num1 && $num2 -ge $num3 ]]; then max=$num2 else max=$num3 fi # Display the maximum number echo "The maximum number is: $max"
    • This script employs conditional statements to determine and print the maximum value among three integer inputs from the user.

  6. Bash script compare three numbers and find largest

    • Description: Bash script to compare three numbers entered by the user and identify the largest one.
    • Code:
      #!/bin/bash # Function to find maximum of three numbers max_of_three() { max=$1 if [ $2 -gt $max ]; then max=$2 fi if [ $3 -gt $max ]; then max=$3 fi echo $max } # Prompt user for input echo "Enter three numbers:" read num1 num2 num3 # Call function and display result result=$(max_of_three $num1 $num2 $num3) echo "The largest number is: $result"
    • This script defines a function max_of_three to find the maximum of three numbers entered by the user and displays the largest number.

  7. Bash script to determine largest number from user inputs

    • Description: Writing a Bash script to determine the largest number among three inputs provided interactively.
    • Code:
      #!/bin/bash # Prompt user for input echo "Enter three numbers:" read num1 num2 num3 # Initialize variable for storing largest number largest=$num1 # Compare with second number if ((num2 > largest)); then largest=$num2 fi # Compare with third number if ((num3 > largest)); then largest=$num3 fi # Display the largest number echo "The largest number is: $largest"
    • This script uses arithmetic comparison within conditional statements to identify and display the largest number among three user-inputted numbers.

  8. Bash script to find largest of three integers with user input

    • Description: Implementing a Bash script to find the largest among three integers provided by the user.
    • Code:
      #!/bin/bash # Function to find maximum of three numbers max_of_three() { max=$1 if (( $2 > max )); then max=$2 fi if (( $3 > max )); then max=$3 fi echo $max } # Prompt user for input echo "Enter three integers:" read num1 num2 num3 # Call function and display result result=$(max_of_three $num1 $num2 $num3) echo "The largest number is: $result"
    • This script defines a function max_of_three to find the maximum of three integers entered by the user and prints the largest number.

  9. Bash script compare numbers and output largest

    • Description: Script to compare three numbers and output the largest one in Bash.
    • Code:
      #!/bin/bash # Prompt user for input echo "Enter three numbers:" read num1 num2 num3 # Determine largest number using conditional checks if ((num1 >= num2 && num1 >= num3)); then largest=$num1 elif ((num2 >= num1 && num2 >= num3)); then largest=$num2 else largest=$num3 fi # Display the largest number echo "The largest number is: $largest"
    • This script uses arithmetic comparisons to determine the largest number among three inputs provided interactively by the user.

  10. Bash script to find maximum of three numbers from user input

    • Description: Writing a Bash script to find the maximum of three numbers entered by the user.
    • Code:
      #!/bin/bash # Prompt user for input echo "Enter three numbers:" read num1 num2 num3 # Use arithmetic comparison to find maximum if [ $num1 -gt $num2 ] && [ $num1 -gt $num3 ]; then max=$num1 elif [ $num2 -gt $num1 ] && [ $num2 -gt $num3 ]; then max=$num2 else max=$num3 fi # Display the maximum number echo "The maximum number is: $max"
    • This script prompts the user to enter three numbers, compares them using conditional statements, and outputs the maximum value.

More Tags

pycurl wildfly ora-01017 case-expression inotifypropertychanged netbeans-6.9 storekit socket.io xsd strsplit

More Programming Questions

More Dog Calculators

More Internet Calculators

More Cat Calculators

More Genetics Calculators