SEB, you gotta find that reply button. By posting your replies in multiple threads you caused me to miss one. I have merged all of your threads into one.
When you boot into single user mode only your file system is mounted. You need to mount /usr and /var at least (if they are separate file systems). Then edit the file. Then umount what ever you mounted and reboot.
Since you changed stuff and screwed up your system, changing things back the way they were might be a useful step. Did you make notes to help you get back to a known state?
If you can get things squared away enough to get a login prompt, sign on as root. Use:
/etc/set_parms ip_address
and follow the instructions to set your ip address. THen use:
/etc/set_parms addl_netwrk
and follow the instructions to srt the subnet mask, default gateway, etc.
HP's documentation is pathetic. What little there is can be found
here. Once there was a NFS Administrator's Guide, and a Managing Berkeley/ARPA Network Services. But HP dropped them years ago. Read that website quick before they drop something else.
I think that HP is dropping documentation to make people take their classes. Maybe you should take a few of them. If you're not a unix user, you should not be reconfiguring a box.