https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253209
Bug ID: 253209
Summary: grep -v -f some-empty-file does the wrong thing
Product: Base System
Version: 13.0-STABLE
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: bin
Assignee: [email protected]
Reporter: [email protected]
# >a
# echo blubb | fgrep -f a
# echo blubb | fgrep -v -f a
#
Actually -v should invert the match however if the file is empty it seems it's
not doing the right thing.
For comparison (some random RedHat):
# uname -a
Linux rh.local 3.10.0-862.3.2.el7.x86_64 #1 SMP Tue May 15 18:22:15 EDT 2018
x86_64 x86_64 x86_64 GNU/Linux
# >a
# echo blubb | fgrep -f a
# echo blubb | fgrep -v -f a
blubb
#
I stumbled over this while debugging a non-working script. I seem to remember
that it was working fine a while ago on stable/12.2.
I suspect related to base r352691 - maybe the removal of the invert logic near
the end of util.c.
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