AT(1) General Commands Manual AT(1)NAME
at, atrun - execute commands at a later time
SYNOPSIS
at time [month day] [file]
EXAMPLES
at 2315 Jan 31 myfile
# Myfile executed Jan 31 at 11:15 pm
at 0900 # Job input read from stdin
at 0711 4 29 # Read from stdin, exec on April 29
DESCRIPTION
At prepares a file to be executed later at the specified time by creating a special entry in /usr/spool/at. The program atrun should be
started periodically, for example, every minute by cron. Atrun checks to see if any files in /usr/spool/at should now be run, and if so,
it runs them and then puts them in /usr/spool/at/past. The name of the file created in /usr/spool/at by at is YY.DDD.HHMM.UU (where YY,
DDD, HH, and MM give the time to execute and UU is a unique number). Note that when the command runs, it will not be able to use stdin or
stdout unless specifically redirected. In the first example above, it might be necessary to put >/dev/log on some lines in the shell
script myfile. The same holds for the commands typed directly to at.
SEE ALSO cron(8).
AT(1)
Check Out this Related Man Page
ATRUN(8) BSD System Manager's Manual ATRUN(8)NAME
atrun -- run jobs queued for later execution
SYNOPSIS
atrun [-l load_avg] [-d]
DESCRIPTION
atrun runs jobs queued by at(1). Root's crontab(5) must contain the line:
*/10 * * * * root /usr/libexec/atrun
so that atrun(8) gets called every ten minutes.
At every invocation, every job in lowercase queues whose starting time has passed is started. A maximum of one batch job (denoted by upper-
case queues) is started each time atrun is invoked.
OPTIONS -l load_avg
Specifies a limiting load factor, over which batch jobs should not be run, instead of the compiled-in value of 1.5.
-d Debug; print error messages to standard error instead of using syslog(3).
WARNINGS
For atrun to work, you have to start up a cron(8) daemon.
FILES
/var/at/spool Directory containing output spool files
/var/at/jobs Directory containing job files
SEE ALSO at(1), crontab(1), syslog(3), crontab(5), cron(8)AUTHORS
Thomas Koenig <ig25@rz.uni-karlsruhe.de>
BUGS
The functionality of atrun should be merged into cron(8).
BSD April 12, 1995 BSD
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