[CentOS] parsing /proc/cmdline

[Ross S. W. Walker]

Ross S. W. Walker wrote:
> Jerry Geis wrote:
> > 
> > Hi - I am not an expert at shell script writing.
> > If /proc/cmdline looks like
> > 
> > option1 option2 ... ks=http://192.168.1.8/ks/ks.cfg option3 
> > option 4 ...
> > 
> > How can I get the 192.168.1.8 out of this cmdline.
> 
> Try:
> 
> # IPADDR=`cat /proc/cmdline | sed 's/.*\/\([1-9][0-9]*\.[0-9][0-9]*\.[0-9][0-9]*\.[0-9][0-9]*\)\/.*/\1/'`
> 
> This will find an IP in between /.../

Actually shorter sed line:

# IPADDR=`cat /proc/cmdline | sed 's/.*\/\([0-9]\+\.[0-9]\+\.[0-9]\+\.[0-9]\+\)\/.*/\1/'`

When testing the '+' operator initially, it didn't work for me,
then it occurred to me to escape it from the shell.

I didn't realize bash used '+', need to look that one up.

Also this regex isn't so picky about ip address validity, but
since it's in kickstart chances are it's a valid ip.

-Ross

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