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Newer BSD users often don't realize that a program that has a file open is also holding a reference.
The prevents the underlying file data from going away while the process is using it.
Applications may not be designed to deal elegantly with this situation and may produce inconsistent or undefined behavior when files that are in use are abruptly truncated in this manner.
This solution is part of Red Hat’s fast-track publication program, providing a huge library of solutions that Red Hat engineers have created while supporting our customers.
This happens also when we delete some files which are not linked to any running processes e.g Old backups or some files which are not being used by any other processes like some avi video files or audio files.
This is an advanced technique and should only be carried out when the administrator is certain that this will cause no adverse effects to running processes.
In BSD a directory entry is simply one of many references to the underlying file data (called an inode).