So, can I still pipe (>>) after a process run in background?
That is not a pipe, that's a file redirection. | is a pipe.
And yes,
That opens the file once in advance and attaches it to stdout, so you don't need to reopen-append the same file 17 times in a row later.
Anything you run inherits the same set of open files as the shell you're running. This is why they all print to the same screen. Change the shell's own "screen" (i.e. standard output, stdout, or file descriptor #1) into a file, and they'll all write to that file.
Two comments
1.
In order to recover from a system crash the pidfile should reside in a file system that is emty or emptied at system boot.
2.
Collecting output from a background process can become garbled, especially if mixed with another stream like the foreground echo at the end.
So the thread so far has left me confused. So I kept digging. If found some code and modified it to this:
So far, this works. The "overviewer.py" is only run from the mcmaps user. And when it is currently running, the script above reports "Running." When it's not running, it accurately states, "Not Running" (so far).
So, would this work? What are the dangers of this?
Here is what I would do for the final script (if people say it would be safe enough):
The idea here is that I run the script as a cron job every 30 minutes. And most of the time, it completes in 10 minutes or less. But if there were a lot of changes for the overviewer.py to work on, the script could take 30+ minutes. In which case, I want the script to exit out and wait for the next scheduled cron job event to run rather than trying to run two instances over overviewer.py.
Am I on the right track? Is this way of doing it flawed?
That's another way to do it.
The ps command lists many processes, but with-u mcmaps the overhead is small.
There might be the problem that ps cuts the overviewer.py to say overview. Run the ps command on the command line to find out!
I have found this bit of code that nearly does what I want.
Basically 3 input fields, I want to copy t2 to t3 as it's typed but only if t1 contains data AND t3 is empty:
<input type="text" id="t1" />
<input type="text" id="t2" />
<input type="text" id="t3" />
<script> var t2 =... (4 Replies)
I have to kill the process "test" for a maintenance I do but want the script to check when it comes back up.
I can get what I want when I run this while loop:
while true;do ps -ef | grep test | grep -v grep | sed -e 's/^*//';sleep 60;done
but I want the script to do it for me and as soon as... (6 Replies)
I have process1 running on one machine and generating some log file. Now another process which can be launched on any machine wants to know if process1 is running or not and also in case it is running it wants to stream the logs file generated by process1 on terminal from which process2 is... (2 Replies)
#!/bin/sh
CHECK='ps aux | grep start.jar | grep -v grep | wc -l'
if
then
/usr/local/jre-1.7.0/bin/java - jar start.jar &
else
fi
Could anybody advise whats up with this code im trying to put this in as a cron job to check that solr search engine is running every 10secs and if... (10 Replies)
Hi,
Can anyone please tell me how to write a shell script to check
whether a process if running or not.... if its still running then wait for sometime and if not then run the next query.
Also, Under my one main script main.sh I have to run 2 scripts simutaneously which take some time to... (2 Replies)
How to I check if a process is running in C? I'm trying to use ps aux |grep "process name" but failing in doing that. How do I do that?
Thanks, (1 Reply)
I'm new to expecting and i want to create a script to ssh to a device,check is a process is running and display that the process is running or not.This is what i have so far
After executing this script i get an error.
#!/usr/bin/expect
set timeout -1
set ip "machine ip goes here"
set... (5 Replies)
How do I make a shell script to see if a certain process is running.
The process shows up on ps aux as /usr/sbin/daemon
eg:
if
/usr/sbin/daemon
else
#nothin
basically i want to run the process if it isnt running/ has been stopped.
Thanks. (2 Replies)
I want to write a unix shell script that will check if a process (say debu) is running in the server or not. If no , then send a mail to the corresponding person to start the process??? (2 Replies)
Hai Friends,
I have to develop a script that checks for a particular process say x.exe once every day and report if its not running say through a blat mail.
I need this to run in a given list of pc from a single point.
Any suggestion of how to go abt this
Thnx for any help (1 Reply)