lsof is a Linux diagnostic tool. Its name stands for list open files, and it does just that. It lists information about any files that are open by processes currently running on the system. It can also list communications open by each process.
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COMMAND contains the first nine characters of the process name.
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PID is the process ID number.
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USER is the user ID number or login name of the user process.
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FD is the file descriptor.
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TYPE is the type of node associated with the file.
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DEVICE contains the device numbers.
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SIZE is the file's size or its offset in bytes.
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NODE NAME is the node number of a local file.
For a more complete description of these columns and options, view the lsof man page using man lsof.
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