The
calendar utility processes text files and displays lines that match certain dates.
The following options are available:
-a
Process the “calendar” files of all users and mail the results to them. This requires super-user privileges.
-d MMDD[[YY]YY]
Display lines for the given date. By default, the current date is used. The year, which may be given in either two or four digit format, is used only for purposes of determining whether the given date falls on a Friday in that year (see below). If the year is not specified, the current year is assumed.
-f file
Display matching calendar files from the given filename. By default, the following filenames are checked for:
and the first which is found is used. The filename may be absolute. If not absolute, it is taken relative to the directory specified by the
CALENDAR_DIR environment variable, if set; otherwise, it is taken relative to the user's home directory. Or, if the
-a flag is given, a non-absolute filename is taken relative to each user's home directory in turn.
-l days
Causes the program to “look ahead” a given number of days (default one) from the specified date and display their entries as well.
-w days
Causes the program to add the specified number of days to the “look ahead” number if and only if the day specified is a Friday. The default value is two, which causes calendar to print entries through the weekend on Fridays.
-x
Causes
calendar not to set the
CPP_RESTRICTED environment variable. Passing this flag allows users the (somewhat obscure) option of including a named pipe via
cpp(1)'s
#include syntax, but opens up the possibility of
calendar hanging indefinitely if users do so incorrectly. For this reason, the
-x flag should never be used with
calendar -a.
Lines should begin with a month and day. They may be entered in almost any format, either numeric or as character strings. A single asterisk (‘*') matches every month, or every day if a month has been provided. This means that two asterisks (‘**') matches every day of the year, and is thus useful for ToDo tasks. A day without a month matches that day of every week. A month without a day matches the first of that month. Two numbers default to the month followed by the day. Lines with leading tabs default to the last entered date, allowing multiple line specifications for a single date. By convention, dates followed by an asterisk are not fixed, i.e., change from year to year.
The “calendar” file is preprocessed by
cpp(1), allowing the inclusion of shared files such as company holidays or meetings. If the shared file is not referenced by a full pathname,
cpp(1) searches in the current (or home) directory first, and then in the directory
/usr/share/calendar. Empty lines and lines protected by the C commenting syntax (
/* ... */) are ignored.
Some possible calendar entries:
#include <calendar.usholiday>
#include <calendar.birthday>
6/15 ... June 15 (if ambiguous, will default to month/day).
Jun. 15 ... June 15.
15 June ... June 15.
Thursday ... Every Thursday.
June ... Every June 1st.
15 * ... 15th of every month.
*15 ... 15th of every month.
June* ... Every day of June.
** ... Every day