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bug#17080: [PATCH] egrep, fgrep: go back to shell scripts

From: Eric Blake
Subject: bug#17080: [PATCH] egrep, fgrep: go back to shell scripts
Date: Wed, 23 Apr 2014 17:21:16 -0600
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.4.0

On 03/23/2014 06:21 PM, Paul Eggert wrote:
> Although egrep's and fgrep's switch from shell scripts to
> executables may have made sense in 2005, it complicated
> maintenance and recently has caused subtle performance bugs.
> Go back to the old way of doing things, as it's simpler and more
> easily separated from the mainstream implementation.  This should
> be good enough nowadays, as POSIX has withdrawn egrep/fgrep and
> portable applications should be using -E/-F anyway.

Possibly related to whoever wants to tackle writing 'egrep' as a C
wrapper program - you need to consider what happens when the user
supplies program_transform_name as part of their configure arguments.
This recent autoconf thread picked on grep as an example - so we'd
better get the example right :)


Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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