nawk command in Linux

I have a nawk command I use in Solaris....

ps -e -o comm | nawk -F'ora_pmon_' 'NF>1 {print $2}'

However it seems that this command will not work in Linux.
Linux bluemarron 2.6.16.54-0.2.12-smp #1 SMP Fri Oct 24 02:16:38 UTC 2008 x86_64 x86_64 x86_64 GNU/Linux

How could I do the same type of thing in Linux?

Thanks

Have you installed nawk? Try awk instead of nawk.

Or gawk