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Unix Version 7 - man page for at (v7 section 1)

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AT(1)											    AT(1)

       at - execute commands at a later time

       at time [ day ] [ file ]

       At squirrels away a copy of the named file (standard input default) to be used as input to
       sh(1) at a specified later time.  A cd(1) command to the current directory is inserted  at
       the  beginning,	followed by assignments to all environment variables.  When the script is
       run, it uses the user and group ID of the creator of the copy file.

       The time is 1 to 4 digits, with an optional following `A', `P', `N' or  `M'  for  AM,  PM,
       noon  or midnight.  One and two digit numbers are taken to be hours, three and four digits
       to be hours and minutes.  If no letters follow the digits, a 24 hour clock time is  under-

       The  optional day is either (1) a month name followed by a day number, or (2) a day of the
       week; if the word `week' follows invocation is moved seven days	further  off.	Names  of
       months and days may be recognizably truncated.  Examples of legitimate commands are

	      at 8am jan 24
	      at 1530 fr week

       At programs are executed by periodic execution of the command /usr/lib/atrun from cron(8).
       The granularity of at depends upon how often atrun is executed.

       Standard output or error output is lost unless redirected.

       activity to be performed at hour hhhh of year day ddd of year yy.  uu is a unique number.
       /usr/spool/at/lasttimedone contains hhhh for last hour of activity.
       /usr/spool/at/past directory of activities now in progress
       /usr/lib/atrun program that executes activities that are due

       calendar(1), cron(8)

       Complains about various syntax errors and times out of range.

       Due to the granularity of the execution of /usr/lib/atrun, there may be bugs in scheduling
       things almost exactly 24 hours into the future.

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