How do you test if a string is a number?
Trying to do something like this:
x="AS"
if( x is not a number ); then
x=0
fi
Because I want to do number arithmetic with x.
ok I guess it's an error if it's not numeric.
Why not :
typeset -i x before assigning it?
Below I write a code with tow output the first one is to numeric arguments and the second if it isn�t numeric
#!/bin/bash
if echo $1 | grep "^[0-9]*$">aux
then
echo "La cadena es un valor numerico."
else
echo "La cadena no es un valor numerico."
fi
rm aux
Enjoy that, and please correct my english 
