#This program accepts three numbers and shows the largest of them
#
echo
echo "Enter three numbers and I will show you the largest of them>> \c"
read num1 num2 num3
if test "$num1" -gt "$num2" -a "$num1" -gt "$num3"
then
   echo "The largest number is: $num1"
elif test "$num2" -gt "$num1" -a "$num2" -gt  "$num3"
then
   echo "The largest number is:$num2"
else
  echo "The largest number is:$num3"
fi
echo "done!"
echo
exit 0

#!/bin/bash

function testnumber {
	if [[ $1 =~ "^[[:digit:]]+$" ]]; then
		return 1;
	elif [[ $1 =~ "^[[:digit:]]+[.][[:digit:]]+$" ]]; then
		return 1;
	else
		return 0;
	fi
}

testray=(1.5 x 14 4f7 this 2 666 1.3.4)

for e in ${testray[@]}; do
	testnumber $e;
	if [[ $? > 0 ]]; then
		echo $e
	fi
done