calendar
[option]Read your calendar file and display all lines that contain the current date. The calendar file is like a memo board. You create the file and add entries like the following:
5/4 meeting with design group at 2 pm may 6 pick up anniversary card on way home
When you run calendar on May 4, the first line is displayed. calendar can be automated by using crontab or at, or by including it in your startup files .profile or .login.
Allow a privileged user to invoke calendar for all users, searching each user's login directory for a file named calendar. Entries that match are sent to a user via mail. This feature is intended for use via cron. It is not recommended in networked environments with large user bases.