I can't test at the moment, but I wrote on the topic of running external commands here, including the advice to check $? for errors and that interpolating variables into the shell is problematic - what does @SetBCs contain exactly? But I think much more important here is: just do this in plain Perl in the first place, a while(<>) loop is fairly easy to implement (perlintro). At the very least you can switch to a module like IPC::System::Simple.

In reply to Re: qx + sed not working by haukex
in thread qx + sed not working by Maestro815

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