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Re: getting 'grepped' files from file list

From: Dave B
Subject: Re: getting 'grepped' files from file list
Date: Tue, 16 Jun 2009 11:54:12 +0200
User-agent: Thunderbird (X11/20090527)

Bob Proulx wrote:

> Dave B wrote:
>> Edward Peschko wrote:
>>> 1: suppose I want to build a 'project' file, which contains a list of
>>> files that I care about - one that avoids temporary files, binary
>>> files, etc. This would then be a very nice feature.
>> You can use xargs to obtain pretty much the same effect.
>> xargs grep pattern < filelist.txt
>> (with the usual issues to consider when using xargs)
> You can avoid using xargs here if you don't want to use it.
>   grep PATTERN $(<filelist.txt)

Yes that's true. I just felt that xargs (well, GNU xargs to be honest) gives
you a bit more control in case the filelist contains filenames with spaces,
wildcards or other oddities, which will cause problems with the
$(<filelist.txt) approach, since the shell does word splitting and pathname
expansion on the result of that.


xargs -d '\n' grep pattern < filelist.txt

should take care of most of the issues. It does require GNU xargs however,
as I said.


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