Unix each user belongs to one or more user groups, which allows
the organization of their rights.
- The type file_perm is an alias for the type
- The options and the behavior of this
command are not standardized. The given example may not be
- Molière, Le Bourgeois Gentilhome, Acte II, scène 4.
- We recall that the signals are handled
in an asynchronous way. So, if two children die one after the other,
it is possible that the signal of the first has not been handled.