Following up on dasgar's explanation: when you run a program at the command line in a terminal window, the default behavior (if you don't use any redirection) is to have both stdout and stderr outputs printed to the terminal.

I don't know about the "cmd.exe" (windows command-line shell), but in any *n*x shell (e.g. bash), you can redirect stdout and stderr independently.

When you use perl to run a shell command via backticks or qx, you could (if you want) include redirection, to have both stdout and stderr print to stream, like this: 

my $major_minor = qx($Bin/$get_version_prog $filer 2>&1)

[download]
(not tested)

In reply to Re: qx not always capturing stdout by graff
in thread qx not always capturing stdout by StuLong

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