== Clearing Deleted Files WITHOUT an Application Restart ==
Ever deleted a file and wondered why the disk space hasn't cleared?
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Chances are the application is still keeping the old file open.
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One way to "release" the file is to restart the application, however 99% of the time this is NOT ideal!!
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1) First we find the file descriptor for the offending file.
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NOTE: you may be spammed with a lot of files from /tmp/ or similar directorys. Find the appropriate file for your situation. 
<sxh bash>
find /proc/*/fd -ls | grep  '(deleted)'
</sxh>
Get the file descriptor from the deleted file, it will look similar to:
<sxh bash>
/proc/6755/fd/6
</sxh>
Once you have this we can delete the file by emptying it. Replacing the following command with the $pid and $fd we got above:
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<sxh bash>
> "/proc/$pid/fd/$fd"
</sxh>
Example:
<sxh bash>
> "/proc/6755/fd/6"
</sxh>
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== JUST ECHO NOTHING INTO THE FILE ==
Instead of deleting large files, simpy echo "" into it:
<sxh bash>
echo "" > /var/log/httpd/large_access.log
</sxh>