During my Internet browsing I didn't find any example with 2 pumps.

Only one is needed. This would do: 

    $TOK_IN = $line;
    pump $TOK while $TOK_OUT !~ /\n\z/;
    print "out: $TOK_OUT";
    $TOK_OUT = '';

[download]

This one is in the docs.

$TOK_OUT doesn't seem to be an ordinary variable.

Change chomp to s/\r?\n\z//.

In reply to Re^3: IPC::Run and subprocess interaction by ikegami
in thread IPC::Run and subprocess interaction by xhudik

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