help
help
Display list of available commands. For example:
  iPXE> help                               
  
  Available commands:
  
    echo            exit            isset           goto            help
    shell           autoboot        config          dhcp            pxebs
    ifopen          ifclose         ifstat          imgfetch        module
    initrd          kernel          chain           imgload         imgargs
    imgexec         boot            imgstat         imgfree         login  
    show            set             clear           route           sanboot