Shorter Hacks 6: pipe stderr

Normal pipes in bash/zsh only redirect stdout to the target process. If you, for example want to grep the output of strace you need to also redirect stderr to the target. You can do this by strace ls |& grep open. On older versions of bash you need the less handy strace ls 2>&1 | grep open.

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The series Shorter Hacks consists of tips and tricks for Linux nerds. Flags, hacks, and features of everyday tools that you might not know already, but that will enrich your life. I currently have a list of around 40 hacks I collected and plan to publish them roughly weekly. In order for this series to continue, please send me your best trick(s). The focus is not on fancy new tools or extensive rc-file content, but little known features in software most people already use. Send them to michael bei schoenitzer punkt de.
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Creative Commons License "Shorter Hacks 6 pipe stderr" by Michael F. Schönitzer is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.