Skip to content


Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP


wrong guess about filter mode when running inside Emacs (or Vim) #106

damil opened this Issue · 4 comments

5 participants

Laurent Dami Torsten Blix Loic Nageleisen jkline-okta Rob Hoelz
Laurent Dami

ack 1.92 decides to go into filter mode when (-p STDIN) is true. Filter mode means that input is taken from stdin and not from files given on the command line. But when running inside Emacs, the condition is true because it's an inferior process, and then nothing happens because Emacs doesn't pipe anything into ack STDIN.
So in such a case we don't want the filter behaviour, and therefore we need a way to forcefully disable filter mode from a command line option.
[problem occured with Emacs 22.3.1 on win32, running ack.el version 0.4]

Torsten Blix

would be solved with issue 90's --[no]filter option

Loic Nageleisen

Can't believe this is not fixed yet, and that flags like -G get dropped when specified.
Same problem with Gedit external tools.

Workaround: wrap ack in a (python) script that creates a pseudo-terminal on stdin (may not work on non-linux).

#!/usr/bin/env python
import sys, pty
search =
argv = ['ack', search]

I get this same error when running ack remotely with sudo:
$ ssh -- sudo ack pattern file
ack: Ignoring 1 argument on the command-line while acting as a filter.

Problems occurs with ahost running versions:
$ ssh -- sudo ack --version
ack 1.96
Running under Perl 5.10.1 at /usr/bin/perl

but does not occur when running the same remote command against a different server with ack 1.96 Running under Perl 5.8.8.

Rob Hoelz hoelzro referenced this issue in petdance/ack2

ack erroneously goes into filter mode #346

Rob Hoelz

Addressed in petdance/ack2#346.

Rob Hoelz hoelzro closed this
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Something went wrong with that request. Please try again.