CALENDAR(1) General Commands Manual CALENDAR(1)
calendar - reminder service
calendar [ - ]
Calendar consults the file `calendar' in the current directory and
prints out lines that contain today's or tomorrow's date anywhere in
the line. Most reasonable month-day dates such as `Dec. 7,' `december
7,' `12/7,' etc., are recognized, but not `7 December' or `7/12'. On
weekends `tomorrow' extends through Monday.
When an argument is present, calendar does its job for every user who
has a file `calendar' in his login directory and sends him any positive
results by mail(1). Normally this is done daily in the wee hours under
control of cron(8).
/usr/lib/calendar to figure out today's and tomorrow's dates
egrep, sed, mail subprocesses
at(1), cron(8), mail(1)
Your calendar must be public information for you to get reminder ser-
Calendar's extended idea of `tomorrow' doesn't account for holidays.