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Re: suggested feature/patch for ls: -P TYPES, --select-file-type=TYPES

From: Paul Eggert
Subject: Re: suggested feature/patch for ls: -P TYPES, --select-file-type=TYPES
Date: Fri, 16 Dec 2005 09:34:19 -0800
User-agent: Gnus/5.1007 (Gnus v5.10.7) Emacs/21.4 (gnu/linux)

Moreno Baricevic <address@hidden> writes:

> My point is that on a populated directory (e.g. /dev on 2.4), filtering
> file types inside ls is faster than doing it externally by parsing a
> huge output.

How much faster?  For example, what is the performance of your
modified version of ls with the -P option, compared to the following
ways of solving the problem without adding options?

time sh -c 'ls -lR -P c /dev' >/tmp/baz
time sh -c 'ls -lR /dev | grep "^c"' >/tmp/foo
time sh -c 'ls -ld $(find /dev -type c -print)' >/tmp/bar

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