This command lets you safely edit the users list created by the package command. It locks the file before
launching the editor, hence protecting against any concurrent update by some package command that could
arrive at the same time (by e-mail). The level of protection this locking buys you depends on the locking
policy you have configured in your ~/.mailagent.
If you are within a package source tree, all you need to say is
edusers
to edit the users file for that package. In order for that particular feature to work properly, the
package must have been placed under dist control, or at least the packinit command from the dist package
must have been run.
Otherwise, you may specify a system name, and optionally a version number if that is not enough to
disambiguate. Using '-' will get you the lattest version available.
In any case, there must be a proper setting of the distribs file to use this command. If that file is not
accurate, the package command will not be able to produce a users file anyway.