Based on your response to my post as well as stevieb's initial post, I'd agree with stevieb that it looks like the command that you're running is sending the response to STDERR. As stevieb has pointed out, his suggestion of using backticks will only let you capture STDOUT. Capture::Tiny can capture both STDOUT and STDERR (and exit code) for system commands.

In reply to Re^3: Capturing bash output without displaying STOUT in terminal by dasgar
in thread Capturing bash output without displaying STOUT in terminal by edimusrex

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