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First, if you know a command, but don’t know how to use it, try the manual ( man page) by entering man command . qqhok slot login For example, man ls to learn about the “ls” command. qqhok slot login The “man” command also has a manual, try it! When using man, press q to quit (you can also use / and n and N to search) Second, if there is no man page, the command