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Re: Why does grep add /dev/null the first time?
From: |
Eli Zaretskii |
Subject: |
Re: Why does grep add /dev/null the first time? |
Date: |
Thu, 14 Aug 2014 22:13:09 +0300 |
> Date: Thu, 14 Aug 2014 11:12:07 -0700 (PDT)
> From: guido@dropbox.com
>
> The (minor) issue with this is that the first time after starting Emacs (and
> only the first time) the shell command actually executed has "/dev/null"
> appended (causing the search to return no results). Any subsequent
> invocations it will work fine.
>
> What am I missing?
See the doc string of grep-use-null-device, which explains that. Its
default value is 'auto-detect', which causes Emacs to invoke Grep once
for the purposes of detecting how to invoke it thereafter.