nohup ksh mail_failures.ksh >temp.out &
As this script calls another 3 scripts and it runs forever..I couldn't kill this job..I tried below
ps -ef | grep nohup
This command giving only one output with pid..after I killed that and
It showing with the different PID
How can I resolve this?
How can we get the pid of parent?
Everytime I do ps -ef |grep nohup I'm getting only one output..and if I try to kill it again it's saying it coming with a different PID..?
Related
I am running the below shell script to run in background ./something.sh &
#!/bin/bash
tail -n0 -f -F service.log | while read LOGLINE
do
done
when i check ps -ef| grep something, i see two processes
20273 1 0 16:13 ? 00:00:00 /bin/bash /something.sh
20280 20273 0 16:13 ? 00:00:00 /bin/bash /something.sh
This is because your script is piping the output of a program to a shell command. When you run this there will be three processes:
The something.sh that you explicitly started
The tail that your script starts
A copy of something.sh that is executing the while loop.
I have installed grakn on unix and earlier it was working fine but now giving issues as it is not able to start.
I tried to run it using below command:
./grakn server start
Getting below error.
Starting Storage-FAILED!
Unable to start Storage
Please run 'grakn server status' or check the logs located under 'logs' directory.
There may be lot of things happening under the hood. Without looking into logs this is hard to tell what exactly happening. You can try killing all the processes and then remove associate pids from /tmp/ directory. Then retry starting grakn server.
$ for KILLPID in `ps ax | grep 'grakn' | awk '{print $1}'`; do kill -9 $KILLPID; done
$ ps -ef | grep defunct | grep -v grep | cut -b8-20 | xargs kill -9
$ rm -rf /tmp/grakn-*
Let me know if it helps.
Can anyone suggest how I might get this working....
I have an R script that takes several minutes to run and writes a few hundred lines of output. I want to write a shell script wrapper around this R script which will launch the R script in the background, pipe its output to a file and start following the bottom of that file. If the user then enters CTRL-C I want that to kill the shell script and tail command but not the R script. Sounds simple right?
I've produced a simplified example below, but I don't understand why this doesn't work. Whenever I kill the shell script the R script is also killed despite apparently running in the background. I've tried nohup, disown etc with no success.
example.R
for(i in 1:1000){
Sys.sleep(1)
print(i)
}
wrapper.sh
#!/bin/bash
Rscript example.R > logfile &
tail -f logfile
Thanks in advance!
The following seems to work on my Ubuntu machine:
#!/bin/bash
setsid Rscript example.R > logfile.txt &
tail -f logfile.txt
Here are some of the relevant processes before sending SIGINT to wrapper.sh:
5361 pts/10 00:00:00 bash
6994 ? 00:00:02 update-notifier
8519 pts/4 00:00:00 wrapper.sh
8520 ? 00:00:00 R
8521 pts/4 00:00:00 tail
and after Ctrl+C, you can see that R is still running, but wrapper.sh and tail have been killed:
5361 pts/10 00:00:00 bash
6994 ? 00:00:02 update-notifier
8520 ? 00:00:00 R
Although appending your Rscript [...] command with & will send it to the background, it is still part of the same process group, and therefore receives SIGINT as well.
I'm not sure if it was your intention, but since you are calling tail -f, if not interrupted with Ctrl+c, your shell that is running wrapper.sh will continue to hang even after the R process completes. If you want to avoid this, the following should work,
#!/bin/bash
setsid Rscript example.R > logfile.txt &
tail --pid="$!" -f logfile.txt
where "$!" is the process id of the last background process executed (the Rscript [...] call).
I am running jar using nohup command
nohup java -jar Test.jar
I can't find PID of the jar I am running. I try with:
ps ax | grep java
but it is not listing, then I tried with
ps -ef | grep nohup
and I got this output
root 8503 7529 0 21:52 pts/0 00:00:00 grep nohup
which of the PIDs is PID of nohup process? The first one 8503 is always diffrent, while the second one is the same.
Maybe the program test.jar is finished. See output in nohup.out. To avoid to display grep as a process, use the following pattern:
ps -aux | grep 'j[a]va'
or
ps -aux | grep java | grep -v grep
The following command in your terminal may help you out to run the script using nohup and redirect the output in your desired file.
General Syntax
nohup some_command &> nohup_log_file.out &
Example
nohup python script.py &> nohup_log_script.out &
i'm running a script from ASP.NET/C# using SharpSsh. I realize when the script runs and i do a ps -ef grep from unix, i see the same script running twice, one in csh -c, and the other with ksh. The script has shebang ksh, so i'm not sure why a copy of csh is also running. Also if i run the same script directly from unix, only one copy runs with ksh. There's no other shell running from within the script.
Most Unix/Linux now have a command or option that will show process trees, with indented list like, look for -t or -T options to ps OR ptree OR ???
USER PID PPID START TT TIME CMD
daemon 1 1 11-03-06 ? 0 init
myusr 221568 1 11-03-07 tty10 1.00s \_ -ksh
myusr 350976 221568 07:52:11 tty10 0 | \_ ps -efT
I bet you'll see that the csh is the user login shell that includes your script as an argument ( you may have to use different options to ps to see the full command-line of the csh process) AND as a sub process you'll see ksh executing your script, and further sub-processes under ksh for any external commands that the script is calling.
I hope this helps.
P.S. as you appear to be a new user, if you get an answer that helps you please remember to mark it as accepted, or give it a + (or -) as a useful answer.