#!/bin/sh
# calc
# description: A simple bash calculator.
# by micxz [at] yahoo.com

if [ $# -ne 3 ]
then
     echo ""
     echo "  USAGE:  calc # [command] #"
     echo ""
     echo "  COMMANDS:"
     echo "         p or +   Plus"
     echo "         m or -   Minus"
     echo "         t or x    Times"
     echo "         d or /    Divided by"
     echo "         help       Displays this list of options."
     echo ""
     exit 1
fi

case "$2" in

p | +)
     let a1=$1+$3
     echo ""
     echo "$1 Plus $3 = $a1"
     echo ""
      ;;

m | -)
     let a2=$1-$3
     echo ""
     echo "$1 Minus $3 = $a2"
     echo ""
      ;;

t | x)
     let a3=$1*$3
     echo ""
     echo "$1 Times $3 = $a3"
     echo ""
      ;;

d | /)
     let a4=$1/$3
     echo ""
     echo "$1 Divided by $3 = $a4"
     echo ""
      ;;

  *)

     echo ""
     echo "  USAGE:  calc # [command] #"
     echo ""
     echo "  COMMANDS:"
     echo "         p or +   Plus"
     echo "         m or -   Minus"
     echo "         t or x    Times"
     echo "         d or /    Divided by"
     echo "         help       Displays this list of options."
     echo ""
     exit 1 ;;

esac
exit 0