1.1. help

$ etcdctl user add --help
NAME:
        user add - Adds a new user

USAGE:
        etcdctl user add <user name or user:password> [options] [flags]

OPTIONS:
  -h, --help[=false]            help for add
      --interactive[=true]      Read password from stdin instead of interactive terminal
      --new-user-password=""    Supply password from the command line flag
      --no-password[=false]     Create a user without password (CN based auth only)