NetBSD/usr.bin/calendar/calendar.1

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.\"     @(#)calendar.1	8.1 (Berkeley) 6/29/93
.\"
.Dd June 1, 2016
.Dt CALENDAR 1
.Os
.Sh NAME
.Nm calendar
.Nd reminder service
.Sh SYNOPSIS
.Nm
.Op Fl avx
.Op Fl d Ar MMDD[[YY]YY]
.Op Fl f Ar file
.Op Fl l Ar days
.Op Fl w Ar days
.Sh DESCRIPTION
The
.Nm
utility processes text files and displays lines that match certain dates.
.Pp
The following options are available:
.Bl -tag -width Ds
.It Fl a
Process the
.Dq calendar
files of all users and mail the results to them.
This requires super-user privileges.
.It Fl d Ar 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.
.It Fl f Ar file
Display matching calendar files from the given filename.
By default, the following filenames are checked for:
.Bl -item -compact -offset indent
.It
.Pa ~/calendar
.It
.Pa ~/.calendar
.It
.Pa /etc/calendar
.El
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
.Ev CALENDAR_DIR
environment variable, if set; otherwise, it is taken relative to the
user's home directory.
Or, if the
.Fl a
flag is given, a non-absolute filename is taken relative to each user's
home directory in turn.
.It Fl l Ar days
Causes the program to
.Dq look ahead
a given number of days (default one) from the specified date and
display their entries as well.
.It Fl w Ar days
Causes the program to add the specified number of days to the
.Dq look ahead
number if and only if the day specified is a Friday.
The default value is two, which causes
.Nm
to print entries through the weekend on Fridays.
.It Fl v
Causes
.Nm
to print version information for itself,
and then exit.
.It Fl x
Causes
.Nm
not to set the
.Ev CPP_RESTRICTED
environment variable.
Passing this flag allows users the (somewhat obscure) option of
including a named pipe via
.Xr cpp 1 Ns No 's
.Li #include
syntax, but opens up the possibility of
.Nm
hanging indefinitely if users do so incorrectly.
For this reason, the
.Fl x
flag should never be used with
.Nm
.Fl a .
.El
.Pp
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
.Pq Sq *
matches every month, or every day if a month has been provided.
This means that two asterisks
.Pq Sq **
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.
.Pp
The
.Dq calendar
file is preprocessed by
.Xr 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,
.Xr cpp 1
searches in the current (or home) directory first, and then in the
directory
.Pa /usr/share/calendar .
Empty lines and lines protected by the C commenting syntax
.Pq Li /* ... */
are ignored.
.Pp
Some possible calendar entries:
.Bd -literal -offset indent
#include	\*[Lt]calendar.usholiday\*[Gt]
#include	\*[Lt]calendar.birthday\*[Gt]

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
.Ed
.Sh FILES
The following default calendar files are provided:
.Pp
.Bl -tag -width calendar.christian -compact
.It Pa calendar.birthday
Births and deaths of famous (and not-so-famous) people.
.It Pa calendar.christian
Christian holidays.
This calendar should be updated yearly by the local system administrator
so that roving holidays are set correctly for the current year.
.It Pa calendar.computer
Days of special significance to computer people.
.It Pa calendar.history
Everything else, mostly U.S. historical events.
.It Pa calendar.holiday
Other holidays, including the not-well-known, obscure, and
.Em really
obscure.
.It Pa calendar.judaic
Jewish holidays.
This calendar should be updated yearly by the local system administrator
so that roving holidays are set correctly for the current year.
.It Pa calendar.lotr
Important dates in the Lord of the Rings series.
.It Pa calendar.music
Musical events, births, and deaths.
Strongly oriented toward rock 'n' roll.
.It Pa calendar.netbsd
Important dates in the history of the
.Nx
project.
Mostly releases and port additions.
.It Pa calendar.usholiday
U.S. holidays.
This calendar should be updated yearly by the local system administrator
so that roving holidays are set correctly for the current year.
.El
.Sh COMPATIBILITY
The
.Nm
program previously selected lines which had the correct date anywhere
in the line.
This is no longer true, the date is only recognized when it occurs
first on the line.
.Pp
In
.Nx 3.0 ,
the
.Nm
command was modified to search the user's home directory instead of the current
directory by default.
Users desiring the historical behavior should set the
.Ev CALENDAR_DIR
environment variable to
.Pa \&. ,
or use the
.Fl f
flag.
.Sh SEE ALSO
.Xr at 1 ,
.Xr cpp 1 ,
.Xr cron 8
.Sh HISTORY
A
.Nm
command appeared in
.At v7 .
.Sh BUGS
.Nm
doesn't handle events that move around from year to year, i.e.,
.Dq the last Monday in April .
.Pp
The
.Fl a
option ignores the user's
.Ev CALENDAR_DIR
environment variable.