hcli help provides a list and brief description of all of the commands available in the Hadoop command-line interface. The basic syntax and usage is shown for each command. You can also specify a command name to view information about the parameters for that command.
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To view help do one of the following:
View Options Description All commands Run hcli to see all commands. Command details Run a specific command without parameters to see details. For example, run hcli system Command parameter options Run a command option with --help. For example, run hcli system start --help