NFS || howto lock a specific file

[czo]

Hi folks

Is there a way to lock a shared file.

The situation is that we are runnung a NFS server, and everything works fine... OOo also locks files fine and it is great.

The problem is that we also share a very important password mannager fiel *.pwm and access the file from the application "pwmanager".. My question i, Is there a way to lock the file, so it is imposible for another user to open the *.pwm file, as long as another user, are working at the file??

I am open for all suggestion there could solve the situation(not just the problem )

Thanks for your time and help..

//Gretz Jones