reading /proc/cmdline

[Klaus Steden]

> Hello, all -
> 
> I use the following example of code in my kickstart file, to get values
> from /proc/cmdline to use later on during the install:
> 
> if grep -i -q "mystring[a-zA-Z0-9]" /proc/cmdline
> then
>     MYSTRING=`cat /proc/cmdline | sed 's/.*mystring=\([^ ]*\).*/\1/'`
> fi
> 
> I think Klaus in fact gave this to me.  However, I've ran into a few
> problems.  It seems that this does not like strings with periods in
> them, such as an IP address.
> 
> Since I know a bit less than nothing about regular expressions, I was
> hoping that someone could give me a hand with this.  I need to modify it
> to allow me to assign a dotted quad string to the MYSTRING variable.
> 
> Again, any help would be greatly appreciated.
> 
Hello again, Dan,

How about ...

if grep -iq "mystring=[a-zA-Z0-9]" /proc/cmdline
then
	MYSTRING=`cat /proc/cmdline | sed 's/.*mystring=\([^ ]*\).*/\1/'`
fi

Quick testing with sh on Linux tells me that it should preserve the dots. It
should just be deleting everything up to, but not including 'mystring=' and
whatever follows that, and then deleting everything after that string, and
returning the match.

REs can be tricky, though, so holler if you get stuck.

Klaus