Hiii

I actually intent to check the integer or floating point number input by user i.e. 23, 100, 55.25, 12.50 ..etc. However, when someone input strings or alpha character, my program has to show invalid input.!! Is there any Unix shell script syntax can help me to check ?

Thanking you

Refer the following URL

http://www.unix.com/shell-programmin...ll-script.html

Are you expecting this.
See the following shell script, It will check the given string is integer or float.

echo "123" | grep "^[0-9]*$"
val=`echo $?`
if [[ $val == 0 ]]
then
        echo "Given string is intiger"
else
        echo "Invalide"
fi
echo "123.3" | grep "^[0-9]*[.][0-9]*$"
val=`echo $?`
if [[ $val == 0 ]]
then
        echo "Given string is float"
else
        echo "Invalide"
fi