[cmd] Notation for "mandatory" and "optional" parameters in "help shell_cmd" output
Adarsh Babu Kalepalli
learn2kab at gmail.com
Sun Mar 1 14:31:26 CET 2020
When we type "help shell_command" at u-boot console.
The syntax for the command usage is displayed.
In most of the cases I noticed parameters enclosed in '' or/and '<>'
or just the sub-command string is provided.
>From the help of most of the commands, and on using them I observed that
parameters enclosed in
-'' could be optional
-'<>' could be mandatory
In some cases, the mandatory parameters were not enclosed in "<>" .
env ask name [message] [size] - ask for environment variable
env edit name - edit environment variable
env exists name - tests for existence of variable
in the above case "name" seems to be a mandatory parameter.
Could you please let me know the notation we follow to indicate the
mandatory and optional input parameters for shell commands in their syntax
(displayed through help) ??
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