On 7/19/07, Jason Kohles <email@xxxxxxxxxxxxxxx
> wrote:
On Jul 19, 2007, at 10:07 AM, Ed Brown wrote:
>> Use python instead.
>
> Or perl. You can substitute any parameter name you want from /proc/
> cmdline, in place of the string 'ip' in the example given earlier:
>
> ip=`cat /proc/cmdline |perl -e 'if (<> =~ /\sip=(.*?)\s/) {print
> $1}'`
>
> ESXIP=`cat /proc/cmdline |perl -e 'if (<> =~ /\sESXIP=(.*?)\s/)
> {print $1}'`
>
Or you can use the -n option to perl, which makes it work quite a bit
like awk anyway (see the perlrun man page)...
ESXIP=`perl -ne '/ESXIP=(\S+)/ && print $1' /proc/cmdline`
What I usually do though, is just exploit bash to do the whole
thing. Stick this at the top of a %pre/%post script, and it will
take anything of the form var=value from /proc/cmdline and turn it
into a variable you can use directly...
set -- `cat /proc/cmdline`
for I in $*; do case "$I" in *=*) eval $I;; esac; done
You can try it from the command line to see how it works...
[root@dev1-mgmt-01 ~]# cat /proc/cmdline
ro root=/dev/SystemVG/RootLV
[root@dev1-mgmt-01 ~]# set -- `cat /proc/cmdline`
[root@dev1-mgmt-01 ~]# for I in $*; do case "$I" in *=*) eval "$I";;
esac; done
[root@dev1-mgmt-01 ~]# echo $root
/dev/SystemVG/RootLV
--
Jason Kohles
email@xxxxxxxxxxxxxxx
http://www.jasonkohles.com/
"A witty saying proves nothing." -- Voltaire
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