It's not a bug, but as they say a feature: gawk tests if stdout is a tty at
startup. If so, all writes are flushed.
This produces the effect which you see. However, it makes gawk slower than it
might be.
mawk has an option -W interactive which makes stdout unbuffered (with the
corresponding performance
issue). mawk's behavior is documented (in the manpage). gawk's behavior isn't
documented in its manpage.
** Changed in: mawk (Ubuntu)
Status: Confirmed => Invalid
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https://bugs.launchpad.net/bugs/382602
Title:
tail piped to awk not processing
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