Shell Scripting Tutorial for Beginners 13 - The case statement Example

#! /bin/bash

echo -e "Enter some character : \c"
read value


case $value in
    [a-z] )
        echo "User entered $value a to z" ;;
    [A-Z] )
        echo "User entered $value A to Z" ;;
    [0-9] )
        echo "User entered $value 0 to 9" ;;
    ? )
        echo "User entered $value special character" ;;
    * )
        echo "Unknown input" ;;
esac

Output:

test@test$ ./hello.sh 
Enter some character : f
User entered f a to z
test@test$ ./hello.sh 
Enter some character : K
User entered K a to z
test@test$ LANG=C
test@test$ ./hello.sh 
Enter some character : K
User entered K A to Z
test@test$ ./hello.sh 
Enter some character : 9
User entered 9 0 to 9
test@test$ ./hello.sh 
Enter some character : 5
User entered 5 0 to 9
test@test$ ./hello.sh 
Enter some character : &
User entered & special character
test@test$ ./hello.sh 
Enter some character : sdsdsdsd
Unknown input
test@test$