PurePerms to control permissions and groups and more. See https://github.com/PurePlugins/PurePerms/wiki/CommandsPurePerms and https://github.com/PurePlugins/PurePerms/wiki/Commands/ppinfo
Command examples
/ppreload/defgroup <group> [world]
/groups /addgroup <group>
/rmgroup <group>
/setgroup <player> <group> [world]
(? /unsetgroup <player> <group> [world] )
/usrinfo <player> [world]
/grpinfo <group> [world]