AppHelpTemplate method sets the custom text/template for application help.

CommandHelpTemplate method sets the custom text/template for command help.

HelpFlagDesc method customized flag name, desc for HelpFlag.

NewApp creates a new console Application with some reasonable defaults for Name, Usage, Version and Action.

NewContext creates a new context.

ShowAppHelp is an action that displays the help.

ShowAppHelpAndExit - Prints the list of subcommands for the app and exits with exit code.

ShowCommandHelp prints help for the given command.

ShowCommandHelpAndExit - exits with code after showing help.

ShowSubcommandHelp prints help for the given subcommand.

ShowVersion prints the version number of the App.

SubcommandHelpTemplate method sets the custom text/template for sub-command help.

VersionFlagDesc method customized flag name, desc for VersionFlag.

VersionPrinter method set custom func for version printer.