shell script to determine if file size equals zero
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just use the -s option to test. much much simpler...
if [ -s $file ]
don't reinvent the wheel. as for what's wrong... quite a few things to be honest, you're test doens't make sense as the entire thing is in quote marks, meaning that it'll always be "true" as if you just provide a string it is true if the string has a length, false if it's null.