How to find what process is locking a file.

In HP-UX, when I tried to delete a certain file, the system complained that this file is currently used. I am wondering if there is a utility which could tell me which process was locking the file. On http://www.sysinternals.com/linux/utilities.shtml, there is a tool called Filemon doing what I want. But it's unavailable under HP-UX platform. I don't mind compiling the source to get it run under my OS.
xingdongjinAsked:
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glassdCommented:
Try looking lsof. We use it on Solaris and it is very useful.

http://freshmeat.net/projects/lsof/
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shivsaCommented:
There is a standard unix commands called fuser.
it will tell u which process is locking the file.

man fuser.

also if u can get lsof, it works the same.
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gheistCommented:
some systems call it fstat or pstat. lsof is more complete sometimes.
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