lsof
A Program That Lists Information about Files Opened by Processes
Lsof lists information about files opened by processes. An open file may be a regular file, a directory, a block special file, a character special file, an executing text reference, a library, a stream, or a network file (Internet socket, NFS file, or UNIX domain socket.) A specific file or all the files in a file system may be selected by path.
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