Not sure the other answers completely explained what is wrong, but: When you pipe them - both are executed and start at the 'same time' with ones output piped to the others input. This the second test.pl can start before the first has even output anything.

The fix is to execute test.pl while capturing its output. Then when that has finished, execute again with the captured output.

perl test.pl > temp_file
perl test.pl < temp_file

[download]
Or some terminals you may be able to do this in one line: 
perl test.pl > temp_file && perl test.pl < temp_file

[download]

In reply to Re: IO::Select woes by Anonymous Monk
in thread IO::Select woes by Anonymous Monk

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