Re: how can i find whether a file has been opened by some other process across a network(not in a single machine)?

> I need a way to find out whether a file has been open by some other process on any machine

In general, you can't. You'll have to do something cooperative, like have every program agree to use a lock file.

It might be sufficient just to wrap accesses to the file with something like this:

# file: vilock
perl -MFile::NFSLock -e '
  $fname = shift; 
  $lock = File::NFSLock->new($fname,"BLOCKING") or die $!; 
  system $ENV{EDITOR}, $fname
' your-important-file
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