#!/bin/bash 
X=10
Y=5
if [ "$X" -gt "$Y" ]; then
        echo "$X is greater than $Y"
elif [ "$X" -lt "$Y"]; then
        echo "$X is less than $Y"
else
        echo "$X is equal to $Y"
fi

#!/bin/bash
case $1 in
        --test|-t)
                echo "you used the --test option"
                exit 0
        ;;
        --help|-h)
                echo "Usage:"
                echo "        myprog.sh [--test|--help|--version]"
                exit 0
        ;;
        --version|-v)
                echo "myprog.sh version 0.0.1"
                exit 0
        ;;
        -*)
                echo "No such option $1"
                echo "Usage:"
                echo "        myprog.sh [--test|--help|--version]"
                exit 1
        ;;
esac
echo "You typed \"$1\" on the command-line"

case string
in
  regex1)
  commands1

   ;;
  regex2)
  commands2
   ;;
 ........
esac