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Full Discussion: at vs crontab
Top Forums UNIX for Dummies Questions & Answers at vs crontab Post 302158845 by rhfrommn on Wednesday 16th of January 2008 11:45:22 AM
Old 01-16-2008
It's pretty simple. At is used to schedule something one time. Cron is used to schedule something repeatedly - every day, hour, week, etc.
 

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Time::CTime(3pm)					User Contributed Perl Documentation					  Time::CTime(3pm)

NAME
Time::CTime -- format times ala POSIX asctime SYNOPSIS
use Time::CTime print ctime(time); print asctime(localtime(time)); print strftime(template, localtime(time)); strftime conversions %% PERCENT %a day of the week abbr %A day of the week %b month abbr %B month %c ctime format: Sat Nov 19 21:05:57 1994 %d DD %D MM/DD/YY %e numeric day of the month %f floating point seconds (milliseconds): .314 %F floating point seconds (microseconds): .314159 %h month abbr %H hour, 24 hour clock, leading 0's) %I hour, 12 hour clock, leading 0's) %j day of the year %k hour %l hour, 12 hour clock %m month number, starting with 1, leading 0's %M minute, leading 0's %n NEWLINE %o ornate day of month -- "1st", "2nd", "25th", etc. %p AM or PM %r time format: 09:05:57 PM %R time format: 21:05 %S seconds, leading 0's %t TAB %T time format: 21:05:57 %U week number, Sunday as first day of week %v DD-Mon-Year %w day of the week, numerically, Sunday == 0 %W week number, Monday as first day of week %x date format: 11/19/94 %X time format: 21:05:57 %y year (2 digits) %Y year (4 digits) %Z timezone in ascii. eg: PST DESCRIPTION
This module provides routines to format dates. They correspond to the libc routines. &strftime() supports a pretty good set of coversions -- more than most C libraries. strftime supports a pretty good set of conversions. The POSIX module has very similar functionality. You should consider using it instead if you do not have allergic reactions to system libraries. GENESIS
Written by David Muir Sharnoff <muir@idiom.org>. The starting point for this package was a posting by Paul Foley <paul@ascent.com> LICENSE
Copyright (C) 1996-2010 David Muir Sharnoff. Copyright (C) 2011 Google, Inc. License hereby granted for anyone to use, modify or redistribute this module at their own risk. Please feed useful changes back to cpan@dave.sharnoff.org. perl v5.12.3 2011-05-12 Time::CTime(3pm)
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