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bug#27931: grep -o fails to count empty lines (Debain Bug #532541)

From: Paul Eggert
Subject: bug#27931: grep -o fails to count empty lines (Debain Bug #532541)
Date: Thu, 3 Aug 2017 13:16:52 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.2.1

On 08/03/2017 06:28 AM, Santiago R.R. wrote:
the -o option, which is supposed to return only the matching
parts of the search, fails:

It's not failing. It's behaving as documented: -o outputs only nonempty matches. Otherwise, commands like 'grep -o "a*"' would output a separate line for each byte in the input. Although this behavior for -o is longstanding and is documented in the manual, it's not in the grep --help output so that's an oversight. I installed the attached to fix grep --help, and am closing the bug report on the GNU side.

Users who want to match empty lines can use 'grep "^$"', which is what I'd expect them to do anyway (-o would be superfluous there even if it included empty matches).

Attachment: 0001-doc-improve-o-help.patch
Description: Text Data

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