Re update 2,

chomp returns what it chomped, if anything. Since the string doesn't end with a newline (the content of $/), chomp returns an empty string or something equally false.

So adjust $/ if you want to chomp something other than newlines. But even then, it makes no sense to check what chomp returns. Use 

chomp($out), print "Output: $out\n" if $out;

[download]
or the saner 
if ($out) { chomp($out); print "Output: $out\n"; }

[download]

Actually, why is the chomp conditional? 

chomp($out);
print "Output: ", length($out) ? $out : "[nothing]", "\n";

[download]

In reply to Re: Get output after running IPC::Run by ikegami
in thread Get output after running IPC::Run by pid

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