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Schell scripts

Updated Mar 27, 2021 ·

Tasks​

Write a bash script for the following:

  • Evaluate an argument provided when script is ran.
  • If argument is "yes", the script should return "That's great!"
  • If argument is "no", the script should return "Why not? Go for it!"
  • If argument is anythign else, the script should return "What's that again?"

Solution​

Create the bash script:

#!/bin/bash

if [ $# -eq 0 ]; then
    echo "Usage: $0 <argument>"
    exit 1
fi

case "$1" in
    "yes")
        echo "That's great!"
        ;;
    "no")
        echo "Why not? Go for it!"
        ;;
    *)
        echo "What's that again?"
        ;;
esac

exit 0

Make the script executable:

chmod +x eval_arg.sh

Run the script with different arguments:

./eval_arg.sh yes
# Output: That's great!

./eval_arg.sh no
# Output: Why not? Go for it!

./eval_arg.sh maybe
# Output: What's that again?