Depending on configuration, IPC::Cmd will use either IPC::Run or IPC:Open3, so will capture STDERR as well as STDOUT.

Called with 1 buffer, IPC::Cmd will put both STDOUT and STDERR in that buffer. Called in list context, it will return seperate buffers for STDOUT and STDERR.

In reply to Re^3: Using IPC::Open3 instead of backtick operator by RonW
in thread Using IPC::Open3 instead of backtick operator by rcrews

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