Re: Diary

[Alfred M. Szmidt]

   >    ,----[ (info "(emacs)Diary") ]
   >    |    The name of the diary file is specified by the variable
   >    | `diary-file'; `~/diary' is the default.  A sample diary file is (note
   >    | that the file format is essentially the same as that used by the
   >    | external shell utility `calendar'):
   >    `----
   >
   >    The shell utility `calendar' is not in modern GNU/Linux.
   >
   > calendar was introduced in System 7, which dates back to 1980, and is
   > quite standard on GNU systems.  What strange system are you using that
   > does not have calendar?

   GNU/Linux

That isn't very specific.  All GNU systems I know of--which includes
quite a bit--include `calender'.