With your call to open you only capture Perl's STDERR, not that of processes that Perl starts.

IPC::Run or IPC::Open3 allow you to capture STDERR of external commands.

I hope that your use of ls is only an example - directory listings are easily obtained in Perl with opendir, readdir and closedir, which make errors readily available in $!. (Or File::Find if you want recursive directory listings).

Perl 6 - second systems done right

In reply to Re: Can't capture STDERR to Variable by moritz
in thread Can't capture STDERR to Variable by Skeeve

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