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����This subchapter looks at date, a UNIX (and Linux) command.

����date is used to set or view the system date and time.

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date

����This subchapter looks at date, a UNIX (and Linux) command.

����date is used to set or view the system date and time.

����$ date
����Mon Sep��3 00:56:17 PDT 2012
����$

����The format for the output is: day of the week, month, day of the month, 24 hour time, time zone, year.

formatted output

����Display the time and/or date with formatting by including formatting options (which can be used to set variables to a specific format).

����$ date '+DATE: %m/%d/%y%nTIME: %H:%M:%S'
����DATE: 11/23/13
����TIME: 22:12:19
����$

����Setting a variable with the current date:

����$ NOW=$(date +"%m/%d/%Y")
����$ echo $NOW
����11/23/2013
����$

Format specifiers (format string starts with +)
Specifier Description Values or example
Day
%a weekday, abbreviated Sun
%A weekday, full Sunday
%d day of the month, two digits, zero filled 08
%e day of the month 8
%j day of year, zero filled 001�366
%u day of week from Monday to Sunday 1�7
%w day of week from Sunday to Saturday 0�6
Week
%U week number, Sunday as first day of week 00�53
%W week number, Monday as first day of week 00�53
%V ISO standard week of the year 01�53
Month
%m two-digit month number 01�12
%h month name, abbreviated Nov
%b month name, localised abbreviation Nov
%B locale's full month, variable length November
Year
%y two-digit year 00�99
%Y four-digit year 2013
%g two-digit year corresponding to the�%V week number
%G four-digit year corresponding to the�%V week number
Century
%C two century digits from year 00�99
Date
%D mm/dd/yy 11/24/13
%x locale's date representation 11/24/2013
%F %Y-%m-%d 2013-11-24
Hours
%l hour (12 hour) 4
%I hour (12 hour), zero-filled 04
%k hour (24 hour) 4
%H hour (24 hour), zero-padded 04
%p locale's upper case AM or PM (blank in many locales) AM
%P locale's lower case am or pm am
Minutes
%M two-digit minute number 05
Seconds
%s seconds since 00:00:00 1970-01-01 UTC (Unix epoch) 1385265929
%S two-digit second number 00�60 (Includes 60 to accommodate a leap second)
%N nanoseconds 000000000�999999999
Time
%r hours, minutes, seconds (12-hour clock) 04:05:29 AM
%R hours, minutes (24 hour clock) 04:05
%T hours, minutes, seconds (24-hour clock) 04:05:29
%X locale's time representation 11:07:26 AM
Date and time
%c locale's date and time Sat Nov 04 12:02:33 EST 1989
Time zone
%z RFC-822 style numeric time zone -0500
%Z time zone name; nothing if no time zone is determinable EST, EDT

literals: ���� %n newline ���� %% percent ���� %t horizontal tab

����By default, date normally fills numeric fields with zeroes. GNU date, but not BSD date, recognizes a modifier between the per cent sign (%) and the format specifier:

����TZ Specifies the time zone, unless overridden by command line parameters. If neither is specified, the setting from /etc/localtime is used.

setting time and date

����Only the root or superuser an set the system date and time. In Mac OS X, you can use the clock system preferences t set the time and date. In Ubuntu-based Linux, you can click on the clock and select Time and Date settings from the menu or click on the System menu, select Adminsitration, select Time and Date.

����Set the time to noon:

����$ date 1200
����$

����Set the time to 3:30:30 a.m.:

����$ date 0330.30
����$

����Set the date to October 31st (Halloween) at 3:30 a.m.:

����$ date 10310330
����$

other

����On November 8, 2010, Ramesh Natarajan named this the number 49 most frequently used UNIX/Linux command at this web page 50 Most Frequently Used UNIX / Linux Commands (With Examples).


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����View music player in action: www.musicinpublic.com/.

����Create your own copy from the original source code/ (presented for learning programming).


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�����UNIX used as a generic term unless specifically used as a trademark (such as in the phrase �UNIX certified�). UNIX is a registered trademark in the United States and other countries, licensed exclusively through X/Open Company Ltd.

����Names and logos of various OSs are trademarks of their respective owners.

����Copyright � 2012, 2013 Milo

����Created: February 28, 2012

����Last Updated: November 23, 2013


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