On 06/17/2015 09:04 PM, Paul J. Lucas wrote: > On Jun 17, 2015, at 12:52 PM, Eric Blake <ebl...@redhat.com> wrote: > >> But you don't always want color when piping. > > I know. I was asking specifically about what grep does (or should do) only > when the user supplies —color=auto. > >> No, we want --color=auto to be tied SPECIFICALLY to a tty… > > Because…?
Historical precedence and consistency among all GNU apps that support --color=auto. And because: alias grep='grep --color=auto' grep | grep should NOT colorize the first grep's output, even though it is going into a pipe to the second grep. When you WANT color as a non-default (or to disable color when outputting to a tty), then you can temporarily override your alias: grep --color=always | grep -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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