Date: Sun, 13 Mar 2005 02:15:00 -0800 From: "Loren M. Lang" <lorenl@alzatex.com> To: Giorgos Keramidas <keramida@ceid.upatras.gr> Cc: Fafa Diliha Romanova <fteg@london.com> Subject: Re: chmod equivalent to find commands Message-ID: <20050313101500.GE18080@alzatex.com> In-Reply-To: <20050312195302.GA77874@gothmog.gr> References: <20050312115359.C14EF4BE6D@ws1-1.us4.outblaze.com> <42330B26.2040508@haystacks.org> <20050312195302.GA77874@gothmog.gr>
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On Sat, Mar 12, 2005 at 09:53:02PM +0200, Giorgos Keramidas wrote:
> On 2005-03-12 10:30, Eric McCoy <emccoy@haystacks.org> wrote:
> >Fafa Diliha Romanova wrote:
> >> hello.
> >>
> >> i know there's an equivalent to these two find commands that
> >> can be summed up in one chmod command:
> >>
> >> find . -type d -exec chmod 755 {} \;
> >> find . -type f -exec chmod 644 {} \;
>=20
> Uhm, why? Even if that were possible, isn't clarity more important that
> stuffing as many actions as possible in one line?
>=20
> What you list above is similar to the way I use for changing the
> permissions of files/dirs and it works all the time.
>=20
> There's no reason to try to write one, long, complicated command just
> for the sake of making it one command instead of two. Otherwise, you
> may as well do more complex stuff like:
Summing it up into one command does not neccessarily mean it's longer or
more complicated. I use the following command all the time to fix
permissions similar to what he seems to be doing. Though it's not
technically equivalent, it's probably all he needs.
chmod -R u=3DrwX,go=3DrX .
My umask of 022 simplifies the command to the following:
chmod -R =3DrwX .
>=20
> find . | while read line; do
> mode=3D''
> [ -d "${line}" ] && mode=3D0755
> [ -f "${line}" ] && mode=3D0644
>=20
> [ -n "${mode}" ] && echo "chmod ${mode} \"${line}\""
> done | sh
>=20
> But this is getting quickly very difficult to remember easily and repeat
> consistently every time you want to do something similar :)
>=20
> >> what would be the best solution here?
> >
> > I would do it the same way you do, but with xargs instead:
> >
> > find . -type X -print0 | xargs -0 chmod XXX
>=20
> This is an excellent way to do this, IMHO.
>=20
> > If you were feeling crazy and use sh:
> >
> > find . | while read path; do \
> > if [ -d "$path" ]; then chmod 755;
> > else chmod 644; fi; \
> > done
>=20
> I guess you meant to write:
>=20
> find . | while read path; do \
> if [ -d "$path" ]; then chmod 755 "${path}";
> else chmod 644 "${path}"; fi; \
> done
>=20
> Otherwise, many chmod failures are the only result.
>=20
> But this has a minor buglet. It will change everything that is not a
> directory to mode 0644. This mode is ok for files, but it may not be ok
> (or it may even fail) for other stuff (symbolic links, for instance).
>=20
> - Giorgos
>=20
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=20
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