bug#22945: Surprising behaviour (bug?) of zgrep in combination with the -f option and process substitutions

[Jim Meyering]

On Tue, Mar 8, 2016 at 3:42 AM, Fulvio Scapin <address@hidden> wrote:
> Hello.
>
> There is a problem with zgrep whenever the -f option actually reads from
> the output of a process substition in bash.
> A willingly trivial example below.
>
> $ mkdir /tmp/test
...
>From /bin/zgrep (Version 1.6, Ubuntu 15.10) one can read

Thank you for the report.
To summarize, with zgrep-1.6, this erroneously prints matches only
from the first file:

  $ zgrep -f <(echo .) <(echo a) <(echo b)
  /dev/fd/12:a

However, with the latest from git (and soon to be gzip-1.7), this now
works as desired:

  $ zgrep -f <(echo .) <(echo a) <(echo b)
  /dev/fd/12:a
  /dev/fd/13:b

I see there is no NEWS entry for this fix and haven't yet identified
the origin of the bug or the commit that fixed it, but will do so.