How to determine if a file is in use
Richard England
rlengland at verizon.net
Wed Nov 4 03:23:20 UTC 2009
On 11/03/2009 01:31 PM, Donald Russell wrote:
> Another system uses FTP to drop files in a directory for me to process.
> I have a bash script to process the incoming files. The script is
> started by cron periodically.
>
> There's a problem if the FTP transfer is still in progress because the
> process begins reading the file even though it isn't complete yet.
>
> From a bash script, is there a way to tell if the file is still being
> written to?
> I was looking at the lsof command, which will tell me if the file is
> opened or not, so that's a possibility... but it sure seems awkward
> for the task.
>
> I could also configure the ftp server to lock files being written, but
> that seems to be discouraged. (based on man vsftpd.conf)
>
> Basically, what I want is something like
> Can I get an exclusive read on file x?
> No - skip that file, go onto the next one
> Yes - start processing that file
> (I'm not concerned about the possible race condition there... I have
> other protections for that)
>
> Thanks for any suggestions...
>
>
>
Perhaps "fuser" might be of use?
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/~~R/
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