Ubuntu :: Cron Leaves Defunct Process When Job Goes Background?
Apr 23, 2011
I'm using cron to run a tunnel. It is a looped script which never exits, and thats why I don't want cron to wait for it. This is a crontab entry:@reboot $HOME/cron/portfw.sh &When I run it manually, everything is ok. But when cron runs it, a defunct sh process keeps running until portfw.sh and it's child are killed. Somehow cron knows that processes spawned in background and keeps waiting for them and ignoring the fact that parent process exited. I tried using setsid to change spawned process group, but it did not full cron, it still knows about child processes
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Sep 13, 2010
Is there anyway to have like a desktop icon in the panel, that like shows all the items on the desktop but leaves the background clear, similar to how it is on windows? I keep creating new folders and i hate it when my desktop gets full.
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Mar 14, 2011
I am trying to set up a simple script to automatically invoke streamripper to record my favourite radio shows. The script works fine in a terminal window (Konsole), but when scheduling this as a cron job (KCron via SystemSettings) a Konsole window pops up catching the streamripper output.
Now stramripper can behave with the --quiet option, and I set output redirects "> /dev/null 2>&1". Inside the script or on the command line of KCron.
Quote:
sh myscript.txt >/dev/null 2>&1
...or just as the script without the "sh" command. Same result. Still the same annoying Konsole terminal window pops up, now with no other content than what Cron obviously generates at the end of the script execution:
Quote:
--------------------------------------------------------------------------------
End of script execution. Type Enter or Ctrl+C to exit.
--------------------------------------------------------------------------------
Well, the whole point of this cron scheduling was to avoid manual intervention and create the MP3 file of the radio show automatically. how to avoid the terminal window completely?
Using KDE 4.5.5 and Fedora 13, Kernel 2.6.34.8-68
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May 13, 2010
I added the unity ppa and installed unity to check it out thinking I could just switch back with
Code:
dpkg-reconfigure gdm
Unity left me with just the purple familiar backdrop and a large black X as the mouse cursor. In running the above statement I'm left with the background and cursor only. how to get unity working and/or how to get back to gnome?
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Feb 3, 2011
I'm writing a script that performs backups from partitions on remote servers. I used to do this with ssh, but that seems to be somewhat slow, so I switched to netcat.I start a listener on the receiving server (which runs the script) like this:netcat -l -p 7000 | dd of=imagefile &and then I make the remote and start a dd piped to netcat. This works quite well started manually and the listener is waiting in the background. However, when I have cron run the same script to automate it, the netcat listener is not started, probably because the "&" thing does not work (or there is something with the piping that behaves differently then)
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Jul 11, 2011
I'm trying to get cron to run a bash script every 15 minutes to change my desktop background
running crontab -e I added
Code:
*/15 * * * * sh /home/ME/Documents/scripts/background.sh
(at first i didnt have the sh before the path of the script but read somewhere i needed that) But it doesnt seem to be running my script works fine if ran straight from the terminal so Dont think thats the problem.
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Apr 22, 2010
I installed Simple Backup Suite [URL] on this Karmic box last week and it ran fine the first time. Now it locks up shortly after I tell it to run a backup. ps shows
Code:
3273 ? 00:00:01 gksu
3274 ? 00:00:01 simple-backup-c
3279 ? 00:00:02 sbackupd <defunct>
3287 pts/0 00:00:00 ps
I re-installed the application, which didn't help.
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Feb 10, 2011
Is there a way for me to tell cron to run an app BUT not run it if a process exist already?
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Feb 16, 2011
I am running Ubuntu 10.10, and I am trying to run a java process in the background of a terminal, so I can continue to use that terminal.
Other applications will run in the background just fine, but when I run my java application, I cannot change the status of the process from "Stopped" after suspending it.
Here is my command syntax, along with some commands I have tried and their outputs:
There were [1]- entries, but I removed them for simplicity.
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Oct 26, 2010
i have ported linux into arm and i want to run two background process on target
i have two c programs a.c and b.c
i have cross compiled them as
arm-linux-gcc -o a a.c
[code]...
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Feb 16, 2010
How can I run a job in background using putty? I'm try to run yum update but it will take some time. if I close putty the process will interrupt.
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Nov 16, 2010
Could you tell me how can I run a process in the background?
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May 18, 2011
q)how can i bring the backgroud process to foreground i tried like below1]hp-linux@hp-linux-desktop:/usr/share$ top
top - 11:28:24 up 1:57, 2 users, load average: 0.55, 0.65, 0.62
Tasks: 158 total, 3 running, 155 sleeping, 0 stopped, 0 zombie
Cpu(s): 6.1%us, 2.9%sy, 0.7%ni, 87.1%id, 3.0%wa, 0.2%hi, 0.1%si, 0.0%st
[code]...
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Jan 17, 2011
I know of terminating a command with & and then moving it into the background by pressing Ctrl-Z and then bg [pid], and I also know of nohup. But say you started a process that turned out to take much longer than one expected, is there a way of pulling, so to speak, this process from another terminal screen into the background so that even if I log off from the server the process would continue?
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Apr 11, 2011
I run
nohup bash -c "while [ true ]; do echo test; done"
from PuTTy SSH client but after this process is not runned in background instead nohup keeps to be foreground process in shell.
SW version: nohup (GNU coreutils) 8.5
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Mar 5, 2011
i want to send a running process to background .. normal commands like sleep i can able to move easily to bg .
# sleep 10
#Ctrl+z
#bg
[code]...
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Feb 23, 2011
Is there some way to see only the process running in the background?
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Jan 14, 2011
Is there any way to run a long process in background so that it still remain in running state even if the user logout the system.
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Feb 10, 2011
I have a process A running in the background. When I start another process B also in the background, the system hangs the moment I hit any key. Process A and B communicate over a socket. Iam not even able to do a telnet to the system. Is there any precautions that I need to take while running in background
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Apr 30, 2011
It's my first post and think not last here. I'm new to Linux system ( had a bit of unix programming at school but forgot already ). Please, take a good care of nooby me Now, let's get to the point
I have CentOS installed on one of my machnce, its my PHP development server. I also wanted to run a Minecraft server on it. I would like to skip autostart with init.d thing and be able to control it's run manually, but remotely. Thing is, when i log via putty to server and start server the server output is in terminal. When I close puty, ran application closes also. So I need to have putty window ran all the time.
So, since many programs can be run as background task (like httpd). Is there a way to log via putty. Start application and send it to process... log out of putty ( and application doesn't shut down with putty)?
Also, would be nice if I was possible to log to putty and switch to that application, so i could see server output, info and Issue commands. Basically, I want to start a service and be able to manage it via putty. and not close it when i terminate putty.
PS: I have installed Windows on CentOS server. Is there a way to issue a system start without loading whole GUI thing? When I was installing it I thought it would be easier to manage it with GUI, but now loading it only eats system resources and i unplugged monitor and mouse nad manage it only from Putty
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Mar 10, 2011
How do you move a running process to the background? For example, type the command sleep 60 on the command line and try moving that process to the background.
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May 18, 2011
I am doing a program that reads data from a gps and some other devices and writes some files with all the information. When I run it normally it works fine, but if I run the program in the background (with the ampersand) files are not created until I bring it to foreground or close it. I am confused, the program should run the same way with and without the ampersand. (Could it be that the main process that creates all the threads does not create them when it is executed in background? It seems like if the program is stopped until I take it to the foreground).
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May 17, 2010
I am trying to solve one problem: When i run my process in background it hogs around 96% of CPU. But when ran in foreground, CPU utilization is almost zero. Is there any difference b/n a background and a foreground process wrto CPU utilization?
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Mar 5, 2010
is it possible in bash to run one command in background and after it's done show output with less? While background process is running I should be able enter another commands.What I have is this (sleep is only for simulation):
Code:
{({ ( tree / > tree.txt && sleep 2) & } && wait && less tree.txt) &} && wait fg &
Problem is that I don't know and I can't find how to move it to the foreground after completion.
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Jun 7, 2011
I am using a program that reads in data from a serial port and then sends that data out over a TCP connection. The problem I'm having is that the only way I know to exit the program is to do a 'kill PID', but doing this means the program doesn't go through the motions of closing the TCP connection properly so I have to wait some random period of time for the port to free itself or else when I try to start it back up it tells me that it can't bind to the specified port.The general structure of the program is as follows
Code:
int main(){
// initialize some stuff
[code]...
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May 30, 2011
How the dhclient retry working(Background Process).
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Feb 1, 2010
Because of my English skills I'll try to explain this subject as best I can, thank you for understanding. Fisrt of all, I am running some program on my slackware in background (using standard method - &). I need to make a script, which allows sending command to this process on my machine from another one. Furthermore this program have to be logged out (standard output f.e. ./myprogram > log.out.txt).It might be a separate Program A which runs my Program B but it cannot be screen, because it is not working like I'd like to and it cannot be java, because it's slow and working not the best so to speak
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Apr 1, 2010
pretty simple. how would you background a process from a script and get its process id at the same time?
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Aug 14, 2011
I would like to backup important files (totaling about 400GB) on my ext 4 RAID 5 array to an ext4 external hard drive over USB (external drive is mounted to /mnt. In the future I'd like to automate the process using rsync and cron so for now I'm using rsync to transfer the files. My problem is that using the rsync command like this: # rsync -Pr "/dir1" "/dir2" "/dir3" "/dir4" /mnt
rsync shows me the checks and transfers for awhile and then throws up an i/o error (wish I had a screenshot to show but I don't). When I ls /mnt I get a similar i/o error. I then check /dev for the drive and find that it no longer shows up. Originally the partition was /dev/sdc1. I tried unplugging the USB at this point, plugging it back in and mounting the drive back to /mnt, however it has now assigned it to (you guessed it) /dev/sdd1. I get the drive mounted and try the original rsync command again, hoping the first error was a fluke or some kind of one-time drive fart. This time it makes it quite a bit further and then throws up the exact same problem. Am I doing something terribly wrong here? As I said, I'm very new to bash so I'm not making some absolutely moronic, newbie mistake.
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Feb 9, 2011
I have 3 processes to be executed in a particular sequence.
ProcessA
ProcessB
ProcessC
The requirement is that all the processes should run as background processes.
ProcessA talks to ProcessB and ProcessC using sockets.
ProcessB talsk to ProcessA only using sockets.
ProcessC talsk to ProcessA only using sockets.
[Code].....
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