[LU-19443] lctl interactive mode - short help not shown for invalid input

• Type: Improvement
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.17.0
• Affects Version/s: Lustre 2.16.0
• Severity: 3
• Assignee: Marc Vef
• Reporter: Marc Vef

Description

When lctl interactive mode is used, it is possible to type "help" to print the short help for a given command. It would be helpful if invalid commands, such as "?", also presented the short help of the command currently being run in interactive mode.

mgs # lctl nodemap
> help
usage: lctl nodemap [COMMAND] [OPTIONS]... [ARGS]
Without any parameters, interactive mode is invoked
Try 'lctl nodemap help <COMMAND>', or 'lctl nodemap --list-commands' for a list of commands.
>
> ?
No such command. Try --list-commands to see available commands.
>
> --list-commands
quit                exit                help                --help
version             --version           list-commands       --list-commands
--ignore_errors     ignore_errors       activate            add
del                 add_range           del_range           banlist_add
banlist_del         fileset_add         fileset_del         fileset_modify
modify              add_offset          del_offset          add_idmap
del_idmap           set_cap             set_fileset         set_sepol
test_nid            test_id             info                net_delay_add
net_delay_del       net_delay_reset     net_delay_list