$ tool --help
NAME:
daily-tools - daily tools command
USAGE:
daily-tools [global options] command [command options] [arguments...]
COMMANDS:
num, n number related commands
time, t time related commands
logic, l logic related commands
ascii, a ascii-code table
help, h Shows a list of commands or help for one command
GLOBAL OPTIONS:
--help, -h show help (default: false)