Thank you for your bug report. I can reproduce your issue on Ubuntu
12.04 (gzip: 1.4-1ubuntu2). This is an upstream bug, therefore it would
be great if you could forward the bug to the developers. As far as I can
see, they are not using a bug tracker but a mailing list:
https://lists.gnu.org/mailman/listinfo/bug-gzip
Note that a workaround exists: Both
zgrep -C 10 17 file.txt.gz
and
zgrep --context=10 17 file.txt.gz
give the expected result.
** Changed in: gzip (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1032831
Title:
zgrep -<NUM> doesn't work if <NUM> is two digits or greater
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