manual pages for megatools

I am trying to get smart with megatools/megacmd. I can see all these commands installed in my system:

mega-attr megadf mega-import mega-mount mega-share mega-backup megadl mega-invite mega-mv mega-showpcr mega-cancel mega-du mega-ipc mega-passwd mega-signup mega-cat mega-errorcode mega-killsession mega-permissions mega-speedlimit mega-cd mega-exclude mega-lcd mega-preview mega-sync mega-cmd mega-exec mega-log mega-put megasync mega-cmd-server mega-export mega-login megaput mega-thumbnail mega-confirm mega-find mega-logout mega-pwd mega-transfers mega-confirmcancel mega-ftp mega-lpwd mega-quit mega-tree megacopy mega-get mega-ls megareg mega-userattr mega-cp megaget megals mega-reload mega-users mega-debug mega-graphics mega-mediainfo mega-rm mega-version mega-deleteversions mega-help mega-mkdir megarm mega-webdav mega-df mega-https megamkdir mega-session mega-whoami

However for most of them there is no man page. I cannot find any deeper manual online. Do not know it these commands have options. Some i cannot guess what they really do. Can anyone tell me where are these commands well documented?

Thx a lot ...