help — Display help on built in commands
help
[command
]
Without a parameter this command lists the in-built
commands understood by the shell. Specifying a command name
prints a brief help message for that command which is
typically the same as using the --help
option.
Example 33. Using the help command
This shows the help command being used to get help on
the help command itself, it then shows obtaining help on
the sh command and obtaining the same
information with the --help
option.
>help Internal commands are: sh autoboot sbcd bast-hdlcd pic-wr pic-rd bast-at2 bast-at dmcfg-rd dmcfg-wr pmu shadow mii ifconfig set [ test console display file hwinfo wrout version nvclear nvunset nvsave nvshow nvset uname sum tasks sleep showhz sysmsg setopt showargs setargs reset memset meminfo peek poke modules ls lsfs help echo dumpfile dump cat cp cd pwd boot load history vtp5 vtp4 vtp3 vtp2 vtp1 sysspeed settime setdate devls date Use: help <command> to get brief explanation <command> --help for command usage (if available) >help help Help on help: Lists available commands, Optional arg gives help on specific command. Please report bugs to <support@simtec.co.uk> >help sh Help on sh: Usage: sh [OPTION] [FILE] start a shell. -i start an interactive shell --help display this help and exit --version output version information and exit Please report bugs to <support@simtec.co.uk> >sh --help Usage: sh [OPTION] [FILE] start a shell. -i start an interactive shell --help display this help and exit --version output version information and exit Please report bugs to <support@simtec.co.uk> >
The Example 3.5, “Getting help on the uname command” is another example of using the help command.