From: Anthony Martinez <pi@...>
Date: 2007-06-28T11:43:46+09:00
Subject: Re: File permissions w/Dir.mkdir

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On Thu, Jun 28, 2007 at 11:24:14AM +0900, John Joyce wrote:
> In OS X 10.4.9, Ruby 1.8.4 when I use:
> Dir.mkdir(file_name, 755)
>=20
> The directories created are drop-box, owner-only.
> It seems the Dir class expects the leading bit.
> So, it should be 0755 and not 755.
>=20
> When using:
> Dir.mkdir(file_name)
>=20
> Without permissions, it appears to default to 0755.
>=20
> Just thought this might be useful for some people.
> Seems like I read this in the Pickaxe, but I forgot.
> It is interesting, since chmod accepts 755 and assumes you mean 0755
> Seems to me that Dir should do the same assuming... but doesn't
>=20

Dir.mkdir accepts octal numbers, which is standard notation for this
sort of thing. A leading 0 makes Ruby interpret it as octal. You *could*
say Dir.mkdir(file_name, 493), but that's sick and twisted.=20

Also, without the second argument it defaults to 0777, which will get
modified by the umask. cf lines 912-917 of dir.c in the ruby 1.8.6
source.

The reason chmod on the command line accepts 755 is because it can
assume you mean octal digits. Also, I think I've come across a few
(weirder) chmods that require the leading 0, but that was a long time
ago.

>=20
> John Joyce
>=20
>=20
>=20

--=20
Pascal keeps your hand tied. C gives you enough rope to hang yourself. C++
gives you enough rope to shoot yourself in the foot.

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