du - Estimate File Space Usage
With this command, the system administrator can find out how much disk space is being used in any directory. An example of output, looking at the directory temp:
The numbers are in one K byte increments. A very useful version of this command is:
du -aS /home |grep ^....[0-9]
Which would show all files in the /home directory that are larger than 50 MB. This is a useful tool for the system administrator to monitor file space usage and to be able to target files that would be the best candidates for deletion if free disk space was at a critically low level.
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