Displaying command help

Display command, and sub-command online help from the command-line interface.

Note: The -h option still displays help for all available commands.

Prerequisites

A running IBM Storage Ceph cluster.
Root-level access to the client node.

Procedure

Use the rbd help command to display help for a particular rbd command and its subcommand:

Syntax
```
rbd help COMMAND SUBCOMMAND
```
To display help for the snap list command:
```
[root@rbd-client ~]# rbd help snap list
```