Linux "calendar" Command Line Options and Examples
reminder service

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's date or tomorrow's. On Fridays, events on Friday through Monday are dis‐ played. The options are as follows: -A num Print lines from today and next num days (forward, future).


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

Command Line Options:

num Print lines from today and next num days (forward, future). Defaults to one. (same as -l)
calendar -A ...
Process the “calendar” files of all users and mail the results to them. This requires superuser privileges.
calendar -a ...
num Print lines from today and previous num days (backward, past).
calendar -B ...
Enforce special date calculation mode for Cyrillic calendars.
calendar -b ...
num Print lines from today and next num days (forward, future). Defaults to one. (same as -A)
calendar -l ...
Use calendarfile as the default calendar file. If this file is not accessible, the system-wide default is used.
calendar -f ...
Act like the specified value is “today” instead of using the current date. If yy is specified, but cc is not, a value for yybetween 69 and 99 results in a cc value of 19. Otherwise, a cc value of 20 is used.
calendar -t ...
To handle calendars in your national code table you can specify “LANG=<locale_name>” in the calendar file as early as possible. Tohandle national Easter names in the calendars, “Easter=<national_name>” (for Catholic Easter) or “Paskha=<national_name>” (for OrthodoxEaster) can be used.A special locale name exists: ‘utf-8’. Specifying “LANG=utf-8” indicates that the dates will be read using the C locale, and thedescriptions will be encoded in UTF-8. This is usually used for the distributed calendar files. The “CALENDAR” variable can be usedto specify the style. Only ‘Julian’ and ‘Gregorian’ styles are currently supported. Use “CALENDAR=” to return to the default (Grego‐rian).To enforce special date calculation mode for Cyrillic calendars you should specify “LANG=<local_name>” and “BODUN=<bodun_prefix>” where<local_name> can be ru_RU.UTF-8, uk_UA.UTF-8 or by_BY.UTF-8.Note that the locale is reset to the user's default for each new file that is read. This is so that locales from one file do not acci‐dentally carry over into another file.Other lines should begin with a month and day. They may be entered in almost any format, either numeric or as character strings. Ifproper locale is set, national months and weekdays names can be used. A single asterisk (`*') matches every month. A day without amonth matches that day of every week. A month without a day matches the first of that month. Two numbers default to the month fol‐lowed by the day. Lines with leading tabs default to the last entered date, allowing multiple line specifications for a single date.“Easter” (may be followed by a positive or negative integer) is Easter for this year. “Paskha” (may be followed by a positive or nega‐tive integer) is Orthodox Easter for this year. Weekdays may be followed by “-4” ... “+5” (aliases last, first, second, third, fourth)for moving events like “the last Monday in April”.By convention, dates followed by an asterisk (‘*’) are not fixed, i.e., change from year to year.Day descriptions start after the first <tab> character in the line; if the line does not contain a <tab> character, it isn't printedout. If the first character in the line is a <tab> character, it is treated as the continuation of the previous description.The calendar file is preprocessed by cpp(1), allowing the inclusion of shared files such as company holidays or meetings. If theshared file is not referenced by a full pathname, cpp(1) searches in the current (or home) directory first, and then in the directory/etc/calendar, and finally in /usr/share/calendar. Empty lines and lines protected by the C commenting syntax (/* ... */) are ignored.Some possible calendar entries (a \t sequence denotes a <tab> character):LANG=CEaster=Ostern#include <calendar.usholiday>#include <calendar.birthday>6/15\tJune 15 (if ambiguous, will default to month/day).Jun. 15\tJune 15.15 June\tJune 15.Thursday\tEvery Thursday.June\tEvery June 1st.15 *\t15th of every month.May Sun+2\tsecond Sunday in May (Muttertag)04/SunLast\tlast Sunday in April,\tsummer time in EuropeEaster\tEasterOstern-2\tGood Friday (2 days before Easter)Paskha\tOrthodox EasterFILEScalendar File in current directory.~/.calendar Directory in the user's home directory (which calendar changes into, if it exists).~/.calendar/calendar File to use if no calendar file exists in the current directory.~/.calendar/nomail calendar will not send mail if this file exists.calendar.all International and national calendar files.calendar.birthday Births and deaths of famous (and not-so-famous) people.calendar.canada Canadian holidays.calendar.christian Christian holidays (should be updated yearly by the local system administrator so that roving holidays are setcorrectly for the current year) Days of special significance to computer people.calendar.croatian Croatian calendar.calendar.discord Discordian calendar (all rites reversed).calendar.fictional Fantasy and fiction dates (mostly LOTR).calendar.french French calendar.calendar.german German calendar.calendar.history Miscellaneous Other holidays (including the not-well-known, obscure, and really obscure).calendar.judaic Jewish holidays (should be updated yearly by the local system administrator so that roving holidays are set cor‐rectly for the current year) Musical events, births, and deaths (strongly oriented toward rock n' roll) New Zealand calendar.calendar.openbsd OpenBSD related events.calendar.pagan Pagan holidays, celebrations and festivals.calendar.russian Russian Cosmic UK calendar.calendar.ushistory U.S. history.calendar.usholiday U.S. World wide calendar.
calendar -w ...