Capture the STDOUT, sure. But STDOUT of what?

If it is output from your own script, do yourself a favor, and simply change all the relevant print statements with calls to a routine that appends to the widget.

If not, are you trying to catch the output of some command that completes quickly? (like, say, man or ls)

In that case, use $var=`command` to capture the stdout of the command into your variable.

If it is the output of a program that will take a while to execute, and produce output at various points in time, then you should open that program with a pipe, like so:

open(COM,"command |") || die "Could not execute command\n";
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. In the last case you will have to arrange something that will check for new output on a regular basis. File::Tail may be of some use with that.