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View the help instructions of df command
To view the help instructions of df, you can use man df , you can also use df --help and whatis df.
whatis: Used to query what function a command performs and print the query results to the terminal.
man: According to the system design help directory, each document will be queried and the content will be displayed.
df --help: Most programs accept this parameter to return a help description, and some also use -h.
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