Re: [PATCH] udev - introduce format escape char

[Kay Sievers <kay.sievers@vrfy.org>]

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... :)

thanks,
Kay


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