at man page on Ultrix

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at(1)									 at(1)

       at, batch - execute commands at a later time

       at time [day] [file]
       at -r job...
       at -l [job...]

       batch [file]

       The  and commands use a copy of the named file (standard input default)
       as input to the or commands at a later time.  When the job  is  run,  a
       command to the current directory is inserted at the beginning, followed
       by assignments to all environment variables.  Also,  when  the  job  is
       run, it uses the user and group ID of the creator of the named file.

       The  command  allows  the user to specify when to execute the commands;
       jobs queued with the command execute the commands when the  load	 level
       of the system permits.

       The environment variables, current directory, and are retained when the
       commands are executed.  However, open files, traps,  and	 priority  are

       Users  are  permitted  to use the and commands if their name appears in
       the file.  If that file does not exist, the file is checked  to	deter‐
       mine if the user should be denied access to and If neither file exists,
       only the superuser is allowed to submit a job.  If only the file exists
       and is empty, global usage is permitted.	 The files consist of one user
       name per line.

       The time argument is 1 to 4 digits.  It can, but does not have  to  be,
       followed	 by  A,	 P,  N or M which stand for AM, PM, noon, or midnight,
       respectively. The A, P, N, and M suffixes are not case-sensitive.   One
       and  two	 digit numbers are interpreted as hours, three and four digits
       as hours and minutes. If three digits are specified, the first digit is
       interpreted  as an hour in the range 0-9, and the second and third dig‐
       its as minutes.	If no letters follow the digits, a 24 hour clock  time
       is presumed.

       In  addition to 1-4 digits, and suffixes A, P, M, N, you can also spec‐
       at hh:mm
       at h:mm
       at ham
       at hpm
       at noon
       at midnight

       The optional day argument is either a month name followed by a day num‐
       ber  or by a day of the week.  If the word week follows the day number,
       the or command is invoked seven days after the day number.   Both  com‐
       mands  also  recognize  standard abbreviations for the days of the week
       and months of the year.	The following are examples of legitimate  com‐
       at 8am jan 24

       at 1530 fr week

       The programs are executed by periodic execution of the command from The
       granularity of depends upon how often is executed.  The	command	 exam‐
       ines the file every minute.  The file determines when is executed.  The
       default is every 15 minutes on the 1/4 hour.  You can edit the file  to
       make the command run more or less frequently.

       Standard output or error output is lost unless it is redirected.

       The and commands write the job number to standard error.

       -r		   Removes  jobs  previously  scheduled	 by or The job
			   number is the number reported at invocation	by  or
			   Only	 the  superuser	 is  allowed to remove another
			   user's jobs.

       -l		   Lists all job numbers for all jobs submitted by the
			   user	 issuing  the  command.	  Even	if the user is
			   root, only numbers for jobs submitted by  root  are
			   displayed.	To see the numbers of all jobs submit‐
			   ted, enter the following command:
			   % ls -l /usr/spool/at

       Due to the granularity of the execution of the command,	there  may  be
       bugs in scheduling jobs to run almost exactly 24 hours into the future.

       The  command  starts  jobs  only at midnight.  Use the command whenever

       Error messages about various syntax errors and times that  are  out  of
       range are reported.

       /usr/lib/atrun	   executor run by cron(8)

       in /usr/spool/at:
	    yy.ddd.hhhh.*  activity for year yy, day dd, hour hhhh.
	    lasttimedone   last hhhh
	    past	   activities in progress
       /usr/spool/at/at.allowlist of allowed users
       /usr/spool/at/at.denylist of denied users
       /usr/spool/at	   spool directory
       /usr/lib/cron	   XOPEN compatibility

See Also
       crontab(5), cron(8)


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