calendar - reminder service
calendar consults the file calendar in the current directory and
prints out lines containing today's or tomorrow's date anywhere in the
line. On weekends, ``tomorrow'' extends through Monday.
When a - command-line argument is present, calendar searches for the
file calendar in each user's home directory, and sends any positive
results to the user by mail (see mail(1)). Normally this is done
daily in the early morning hours under the control of cron (see
cron(1M)). When invoked by cron, calendar reads the first line in the
calendar file to determine the user's environment.
Language-dependent information such as spelling and date format
(described below) are determined by the user-specified LANG statement
in the calendar file. This statement should be of the form
LANG=language where language is a valid language name (see lang(5)).
If this line is not in the calendar file, the action described in the
EXTERNAL INFLUENCES Environment Variable section is taken.
calendar is concerned with two fields: month and day. A month field
can be expressed in three different formats: a string representing the
name of the month (either fully spelled out or abbreviated), a numeric
month, or an asterisk (representing any month). If the month is
expressed as a string representing the name of the month, the first
character can be either upper-case or lower-case; other characters
must be lower-case. The spelling of a month name should match the
string returned by calling nl_langinfo() (see nl_langinfo(3C)). The
day field is a numeric value for the day of the month.
If the month field is a string, it can be followed by zero or more
blanks. If the month field is numeric, it must be followed by either
a slash (/) or a hyphen (-). If the month field is an asterisk (*),
it must be followed by a slash (/). The day field can be followed
immediately by a blank or non-digit character.
The day field is expressed as a numeral. What follows the day field
is determined by the format of the month. If the month field is a
string, the day field must be followed by zero or one dot (.) followed
by zero or more blanks. If the month field is a numeral, the day
field must be followed by either a slash (/) or a hyphen (-). If the
month field is an asterisk, the day field must be followed by a slash
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LC_TIME determines the format and contents of date and time strings
when no LANG statement is specified in the calendar file.
LANG determines the language in which messages are displayed.
If LC_TIME is not specified in the environment or is set to the empty
string, the value of LANG is used as a default for each unspecified or
empty variable. If LANG is not specified or is set to the empty
string, a default of "C" (see lang(5)) is used instead of LANG. If
any internationalization variable contains an invalid setting,
calendar behaves as if all internationalization variables are set to
"C". See environ(5).
International Code Set Support
Single- and multi-byte character code sets are supported.
The following calendar file illustrates several formats recognized by
Friday, May 29th: group coffee meeting
meeting with Boss on June 3.
3/30/87 - quarter end review
4-26 Management council meeting at 1:00 pm
It is first of the month ( */1 ); status report due.
In the following calendar file, dates are expressed according to
European English usage:
On 20 Jan. code review
Jim's birthday is on the 3. February
30/3/87 - quarter end review
26-4 Management council meeting at 1:00 pm
It is first of the month ( 1/* ); status report due.
To get reminder service, either your calendar must be public
information or you must run calendar from your personal crontab file,
independent of any calendar - run systemwide. Note that if you run
calendar yourself, the calendar file need not reside in your home
calendar's extended idea of ``tomorrow'' does not account for
This command is likely to be withdrawn from X/Open standards.
Applications using this command might not be portable to other
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calendar was developed by AT&T and HP.
/usr/lbin/calprog to figure out today's and tomorrow's dates
cron(1M), nl_langinfo(3C), mail(1), environ(5).
calendar: SVID2, SVID3, XPG2, XPG3
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