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

From: Reuben Thomas
Subject: Re: ls -l|head seems to look at all files in directory
Date: Mon, 25 May 2009 15:23:15 +0100 (BST)
User-agent: Alpine 2.00 (DEB 1167 2008-08-23)

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.

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