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Re: ls -l|head seems to look at all files in directory

From: Pádraig Brady
Subject: Re: ls -l|head seems to look at all files in directory
Date: Mon, 25 May 2009 16:36:03 +0100
User-agent: Thunderbird (X11/20071008)

Reuben Thomas wrote:
> On Mon, 25 May 2009, Jim Meyering wrote:
>> To do what he wants you have to know that ls -1U is the only
>> way to get one output entry per readdir call.
>> Reuben, you want to do it like this:
>>  ls -1U|head|xargs ls -l
> Thanks for the hint about -1, but this doesn't seem to make any
> difference: I run "ls -1U|head" in a directory with lots of files (about
> 10,000) and it pauses for a minute or so before giving me my ten lines
> of output.
> If I run the command again, then of course it runs almost instantly, so
> I'm not sure what use the loops are in the tests you give.

With the ls on fedora 8 (coreutils 6.9) I see all the
redundant getdents64() calls when using strace on Jim's command above.
With the latest coreutils I do not.


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