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In order to check the free and usage space per file system and directory and each sub directory we have two command

1. df
2. du

the ‘df’ command reports on a per file system basis. It report total disk space , disk space used , disk space free

#df –h

-h : used multipliers such as G or M for gigabytes and Megabytes

The ‘du’ command reports the number of kilobytes contained by the items within a directory

#du –s

#du –h

-s : used to request only the summary directory information

#du –s /etc