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How to recognize if a file still opened by any process?

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# 1  
Old 06-16-2008
How to recognize if a file still opened by any process?
Is there a way to tell for sure if a file currently is opened by any running process?

I have a task to filter a text file which is produced by some long process.
I have no way to communicate with that process, but I have access to a location, where that proces produce an output file.

Need to filter the output file in some data.
The problem is that it is not obviouse if file is done or the process is still working.
The best way is to correct a file as soon as it is complited.

Appreciate any suggestions.
# 2  
Old 06-16-2008
Hammer & Screwdriver there is a function 'lsof'
This lists open files. You may need to download and install in order to use this. (Or, it may already be installed on your system.)
# 3  
Old 06-16-2008
Many systems have the fuser(1) command which can be used to identify processes using files, or filesystems.
# 4  
Old 06-17-2008
Thank you, guys, for replay and advices.
Quote:
Originally Posted by joeyg
This lists open files. You may need to download and install in order to use this. (Or, it may already be installed on your system.)
I've check our system, and there is not 'isof' in man-pages and in all main locations.
Maybe it is some C function?
5 minut research on internet did not bring any result.


Quote:
Originally Posted by fpmurphy
Many systems have the fuser(1) command which can be used to identify processes using files, or filesystems.
Thank you, fpmurphy!
We have this command in our system and, it seems, this one could be perfectly used for this task.
I will try to use it!
Appreciate your help!
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