interval in a launchd script

Login or Register for Dates, Times and to Reply

Thread Tools Search this Thread
# 1  
interval in a launchd script


i'm planning a to automate my backup with a rsync user deamon in my launchd and let that run every 2 hours.
my server contains a lot of video data which can expand rapidly , up to 1TB, in an interval of 2 hours.
now i'm wondering what will happen when a rsync is running longer then the interval and the next command is already given. will it abort one of them? place them in a cue? or will it start running anyway? in the last case i can imagine that this will cause incomplete/corrupt files on my backup filesystem.
does anyone know the answer to this?

thanks in advance,

# 2  
Doesn't look like you're getting much response here.

I understand that launchd is intended to replace cron, among other things. And I haven't really looked at that aspect of launchd. I have created stuff that runs at startup with it.

What you are talking about has two components. One is the basic running things every 2 hours. If you've got that, then ok. I'd be inclined to just toss it in cron, because that still works.

The other aspect is how to deal with the previous instance still being running. If you create your own shell script, instead of directly running rsync, then you can do a couple of different things. One of the more common approaches is to implement a pid file. When the script runs, it checks to see if the pid file exists. If it does, the script terminates, with maybe a log or error message. If it doesn't it creates it. Then when it is done, it removes it.

So, something like

echo $$ > /var/run/

would put the process id of the current script into that location.

Anyway, after the book keeping, the script would launch rsync.

Part of the reason I didn't respond sooner was that I don't know what facilities launchd has built in for managing this sort of thing. I could be giving you an outdated solution to something that launchd has solved more elegantly.
Login or Register for Dates, Times and to Reply

Previous Thread | Next Thread
Thread Tools Search this Thread
Search this Thread:
Advanced Search

Test Your Knowledge in Computers #276
Difficulty: Easy
OpenSolaris was based on Solaris, which was originally released by Sun in 1999.
True or False?

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Expect command when triggered by launchd

Hi folks, Im having trouble with an expect command in a shell script I use to back up mac os x servers. This one is being run on a 10.8.2 Server as part of a larger bash script. The script executes perfectly all the way through when triggered on the command line, but when launchd triggers it at... (4 Replies)
Discussion started by: rowie718
4 Replies

2. UNIX for Dummies Questions & Answers

Launchd-owned processes unexpected behavior

Ok, so I have been struggling with this for a few days and I think I need an explanation of a few things before I go any further. I'm not sure it's possible to do what I'm trying, so before I pull my hair out, here is what I'm doing: I have written a program in LiveCode that sits on our... (2 Replies)
Discussion started by: nextyoyoma
2 Replies

3. Shell Programming and Scripting

Calculate packet in/out interval script

Hello I'm trying to find interval for packet IN/OUT for a gateway. log looks like: 02.12.2011 16.28.29:200 PDU IN CI:424 TRID:200 ID:N/A EID:N/A EX:N/A PDU:0000001f0000000100000000000000c874746f700074746f70000034010100 02.12.2011 16.28.29:228 PDU OU CI:424 TRID:200 ID:N/A EID:N/A EX:ACK... (3 Replies)
Discussion started by: samer.odeh
3 Replies

4. Shell Programming and Scripting

How to run a script everyday between 7 and 8 pm with the time interval of 5 minutes?

Hi, Can someone help me in running a cronjob everyday between 7 and 8 pm with the time interval of 5 minutes in between to repeat that script. The script is so small and I need that to run daily between this time. Please if possible provide me the syntax for this logic. Thanks. (4 Replies)
Discussion started by: cya
4 Replies

5. OS X (Apple)

[launchd] Creating a basic firewall

Hi, I'm trying to use launchd to detect whether certain ports are opened and if they are then to take some appropriate action, e.g. close the port or, worst case scenario, down the whole net connection. Apparently, force closing a port is not possible without killing the offending binary so... (3 Replies)
Discussion started by: ASGR
3 Replies

6. Shell Programming and Scripting

compare the interval of 2 numbers of input2with interval of several numbers of input1

Help plz Does any one have any idea how to compare interval ranges of 2 files. finding 1-4 (1,2,3,4) of input2 in input1 of same key "a" values (5-10, 30-40, 45-60, 80-90, 100-120 ). Obviously 1-4 is not one of the range with in input1 a. so it should give out of range. finding 30-33(31,32,33)... (1 Reply)
Discussion started by: repinementer
1 Replies

7. UNIX for Dummies Questions & Answers

Run script in the background with a time interval

I have a script I want to run in the background, and I have looked it up but I am not exactly sure how to do. First of all to run it in the background do you have to put something in the script or is it just a command when you go to run it. I found this solution to it but once again I am not to... (2 Replies)
Discussion started by: mauler123
2 Replies

8. Shell Programming and Scripting

run script 1 minute interval without CronTab

I am using Solaris 9. I wish to run my script every 1 minute inteval. Though i can run it using below entry in crontab. * * * * /export/home/username/script/file_exist_& in short above script will check whether a specific file exist in a directory. If it found it will inovke another... (10 Replies)
Discussion started by: thepurple
10 Replies

9. Shell Programming and Scripting

script to run repeatedly after a fixed interval of time

Hi , I am working on the following script . I want this script to run and scan the log file repeatedly after 3 hours. This script will run & scan just for the current date logs and after every 3 hours. Kindly advice what to add in this script for this purpose. #!/bin/sh diff common.log... (3 Replies)
Discussion started by: himvat
3 Replies

10. Shell Programming and Scripting

Shell Script Run Interval to be dynamic

Hi All. I have a script which has to be run periodically. The frequency of its run will be decided by a Database stored value PollRate. e.g. If PollRate value is 300secs, then the script should be executed every 5 minutes, if it's 1500secs, it should execute every 15 minutes. Is there... (5 Replies)
Discussion started by: rahulrathod
5 Replies

Featured Tech Videos