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What it is complaining about is the use of back ticks (`), which should be left out.

As Scrutinizer rightly said, remove the back-ticks on line 13..

With those back-ticks, your shell is assuming that the values of num and i are commands...

No-one mentioned using single [ ... ], and I suspect you missed a space between [ and $num. Please use code tags, when posting code.

Use:


[[ $num > $i ]]


Or:


[ "$num" -gt "$i" ]