From: Greg KH <greg@kroah.com>
To: linux-hotplug@vger.kernel.org
Subject: Re: [PATCH] udev - introduce format escape char
Date: Tue, 13 Jan 2004 19:32:09 +0000 [thread overview]
Message-ID: <20040113193209.GA3483@kroah.com> (raw)
In-Reply-To: <20040113021932.GA9850@vrfy.org>
On Tue, Jan 13, 2004 at 08:25:50PM +0100, Kay Sievers wrote:
> On Tue, Jan 13, 2004 at 10:42:35AM -0800, Greg KH wrote:
> > On Tue, Jan 13, 2004 at 03:19:32AM +0100, Kay Sievers wrote:
> > > This patch adds a '%' to the format char list, so that a external
> > > program may called with a non expanded '%' like:
> > >
> > > PROGRAM="/bin/date +%%s"
> > >
> > > Olaf Hering asked for the feature.
> > > A tricky test is also added :)
> >
> > Hm, does this mean that we can't pass a "%n" to a program as it is
> > something we intrepret (your test seems to verify this)?
>
> No, it wasn't possible before. That's why we have the escape now.
> If you want to pass any '%' down to a program, you need to ecape it
> by '%%', otherwise we try to expand it with our own format char list.
>
> I will put in the man page, later today.
>
> In my stupid test, the program returns a '%n' and this is expanded
> inside the '%c' to the kernel number. I found it funny... :)
Ah, that makes more sense now, thanks.
I need to wake up today...
greg k-h
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prev parent reply other threads:[~2004-01-13 19:32 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-01-13 2:19 [PATCH] udev - introduce format escape char Kay Sievers
2004-01-13 18:42 ` Greg KH
2004-01-13 19:25 ` Kay Sievers
2004-01-13 19:32 ` Greg KH [this message]
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