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Top Forums UNIX for Advanced & Expert Users Crontab spawning multiple at processes Post 302225966 by Annihilannic on Sunday 17th of August 2008 11:59:14 PM
Old 08-18-2008
I agree that it sounds like something is going wrong there, and I'm not sure what's causing it. But what I don't understand is why you are using crontab at all. When you want to schedule a recording, just run the at command once, as you had in the bash script... job done? It will only run once, at the scheduled time, and then it will be forgotten about.
 

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ns_sched(3aolserver)					    AOLserver Built-In Commands 				      ns_sched(3aolserver)

__________________________________________________________________________________________________________________________________________________

NAME
ns_after, ns_cancel, ns_pause, ns_resume, ns_schedule_daily, ns_schedule_proc, ns_schedule_weekly, ns_unschedule_proc - commands SYNOPSIS
ns_after seconds {script | procname ?args?} ns_cancel id ns_pause id ns_resume id ns_schedule_daily ?-thread? ?-once? hour minute {script | procname ?args?} ns_schedule_proc ?-thread? ?-once? interval {script | procname ?args?} ns_schedule_weekly ?-thread? ?-once? day hour minute {script | procname ?args?} ns_unschedule_proc id _________________________________________________________________ DESCRIPTION
ns_after run the specified script or procedure after the specified number of seconds ns_after returns an id which can be used with the ns_pause, ns_cancel and ns_resume apis. ns_cancel stops the scheduled running of the id returned by an ns_after returns 1 if unscheduled 0 if the script of procedure couldn't be unscheduled ns_pause pauses the scheduled running of the id returned by an ns_after returns 1 if paused, 0 if the script of procedure couldn't be paused ns_resume resumes the scheduled running of the id returned by an ns_after returns 1 if resumed, 0 if the script of procedure couldn't be resumed ns_schedule_daily ns_schedule_daily runs the specified Tcl script or procedure (procname) once a day at the time specified by hour and minute. The hour can be from 0 to 23, and the minute can be from 0 to 59. Specify -thread if you want a thread created to run the procedure. This will allow the scheduler to continue with other scheduled procedures. Specifying -thread is appropriate in situations where the script will not return immediately, such as when the script performs network activity. Specify -once if you want the script to run only one time. The default is that the script will be re-scheduled after each time it is run. ns_schedule_daily returns an id number for the scheduled procedure that is needed to stop the scheduled procedure with ns_unsched- ule_proc. ns_schedule_proc ns_schedule_proc runs the specified Tcl script or procedure (procname) at an interval specified by interval. The interval is the number of seconds between runs of the script. Specify -thread if you want a thread created to run the procedure. This will allow the scheduler to continue with other scheduled procedures. Specifying -thread is appropriate in situations where the script will not return immediately, such as when the script performs network activity. Specify -once if you want the script to run only one time. The default is that the script will be re-scheduled after each time it is run. ns_schedule_proc returns an id number for the scheduled procedure that is needed to stop the scheduled procedure with ns_unsched- ule_proc. ns_schedule_weekly ns_schedule_weekly runs the specified Tcl script or procedure (procname) once a week on the day specified by day and the time speci- fied by hour and minute. The day can be from 0 to 6, where 0 represents Sunday. The hour can be from 0 to 23, and the minute can be from 0 to 59. Specify -thread if you want a thread created to run the procedure. This will allow the scheduler to continue with other scheduled procedures. Specifying -thread is appropriate in situations where the script will not return immediately, such as when the script performs network activity. Specify -once if you want the script to run only one time. The default is that the script will be re-scheduled after each time it is run. ns_schedule_weekly returns an id number for the scheduled procedure that is needed to stop the scheduled procedure with ns_unsched- ule_proc. ns_unschedule_proc id ns_unschedule_proc stops a scheduled procedure from executing anymore. The scheduled procedure to be stopped is identified by its id, which was returned by the ns_schedule* function that was used to schedule the procedure. EXAMPLES
ns_after ns_cancel ns_pause ns_resume This example illustrates a web interface used to manage jobs. Depending on the action provided a job can be created, cancelled, paused or resumed. set action [ns_queryget action] set job [ns_queryget job] switch $action { create { set job [ns_after 10 [ns_queryget script]] ns_puts "Job created with id: $job" } cancel { if {[ns_cancel $job]} { ns_puts "Job $job cancelled" } else { ns_puts "Job $job not cancelled" } } pause { if {[ns_pause $job]} { ns_puts "Job $job paused" } else { ns_puts "Job $job not paused } } resume { if {[ns_resume $job]} { ns_puts "Job $job resumed" } else { ns_puts "Job $job couldn't be resumed" } } default { ns_puts "Invalid action $action" } } ns_schedule_daily This example defines a script called rolllog that uses ns_accesslog to roll the access log to a file with an extension containing the current date. The ns_schedule_daily function is used to execute the rolllog script on a daily basis. # Script to roll and rcp log file to host "grinder" proc rolllog {} { set suffix [ns_strftime "%y-%m-%d"] set new [ns_accesslog file].$suffix ns_accesslog roll $new exec rcp $new grinder:/logs/[file tail $new] } # Schedule "rolllog" to run at 3:30 am each morning ns_schedule_daily -thread 3 30 rolllog ns_schedule_proc proc dosomething blah { ns_log Notice "proc with arg '$blah'" } ns_schedule_proc 10 dosomething $arg1 SEE ALSO
KEYWORDS
schedule pause resume unschedule cancel after AOLserver 4.0 ns_sched(3aolserver)
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