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You need to insure the script is in your path (environment).

One way ahead is to use the full path to the script. There are other ways to solve this problem as well.

Maybe post back the output...

Use bc

if (( $(echo "$num1 > $num2" |bc -l) )); then
echo "ok"
fi


bc does floating point comparisons, in bash you have to surround it with (( )) to get a boolean (true/false) result.

I am assuming you are using bash or perhaps a POSIX shell like dash.
Your error is telling you that it is not possible to do such a task as these shells have INTEGER arithmetic only.

If you need...