FTA: <i>I’d be really excited to hear all the use cases for gcal one can come up with. Seems really suited for a TODO list manager or to never forget a birthday again.</i><p><pre><code>  $ man calendar
  CALENDAR(1)                 General Commands Manual                CALENDAR(1)

  NAME
     calendar - reminder service

  SYNOPSIS
     calendar [-abw] [-A num] [-B num] [-f calendarfile] [-t [[[cc]yy]mm]dd]

  DESCRIPTION
     The calendar utility checks the current directory or the directory
     specified by the CALENDAR_DIR environment variable for a file named
     calendar and displays lines that begin with either today&#x27;s date or
     tomorrow&#x27;s.  On Fridays, events on Friday through Monday are displayed.

  [...]</code></pre>