It's hard to understand from all this code what your problem is. I'd say open $fh, '-|', $prog should do.

and if MODE is -|, the filename is interpreted as a command that pipes output to us.

Furthermore you have to read line by line (not "slurp") till you either get the desired EOF or you decide to close the $fh.

But first things first

• what is Print , is that a typo of print ?
• what do you do about the error message No such file or directory at /home/jj/eclipse-workspace/ReadGas/ReadFromRadio.pl line 50.

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