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Re: assigning a value to a variable in 00_header


From: Andreas Born
Subject: Re: assigning a value to a variable in 00_header
Date: Wed, 02 May 2012 19:18:35 +0200

----- Urspr√ľngliche Mitteilung -----
> Sorry,
> the source code examples I've sent are from grub.cfg and not from 
> 00_header - in 00_header a $ needs to be escaped with \
> 
> Greetings
> Joachim
> 
> Am 02.05.2012 15:12, schrieb Joachim Mammele:
> > Hi everybody,
> > 
> > I'd like to add a value to a user variable in 00_header but I get the 
> > error "not an assignment".
> > but if I echo directly the value everything works fine.
> > 
> > What can I do? How can I use a variable my_variable? Is there another 
> > way to check for different values of \$?   ?
> > 
> > Any help would be appreciated.
> > 
> > Greetings
> > Joachim
> > 
> > 
> > this is what is working fine:
> > 
> > checkfrontkeys
> > echo "pressed key: \$?"
> > 
> > 
> > -------------
> > 
> > this is what I'm struggling with (I've also been trying to use "case 
> > \$? "instead of "if $pressed_key" but this didn't work neither):
Why the use of \ with case?
> > 
> > checkfrontkeys
> > set pressed_key = $?
You seem to have a space here. In (ba)sh generally and not only grub2 no spaces 
are allowed between the assignment operator and the respective 
identifier/argument.
This should works:
set pressed_key=$?
> > echo "pressed key: "
> > echo $pressed_key
> > echo "\n"
> > 
> > if [ $pressed_key == 1 ]; then
> > echo "pressed 1"
> > set default="1"
> > elif [ $pressed_key == 2]; then
> > echo "pressed 2"
> > set default="2"
> > elif [ $pressed_key == 3]; then
> > echo "pressed 3"
> > set default="3"
> > elif [ $pressed_key == 4]; then
> > echo "pressed 4"
> > set default="4"
> > else
> > echo "nothing pressed\n"
> > set default="6"
> > 
> > fi
I don't see how you should need this. Assigning a numeric value to default 
directly works fine here. I guess a case (not sure whether implemented) or some 
other sort of sanity checking should be enough.
Be aware too that menuentries are numered starting with zero.
> > 
> > echo "default = ${default}\n"
> > echo "after checkfrontkeys"
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > _______________________________________________
> > Grub-devel mailing list
> > address@hidden
> > https://lists.gnu.org/mailman/listinfo/grub-devel
> 




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