When I run my shell script so much of java error handling messages get displayed every single time I ran it.
I want an option of not display it to the screen for now since I am testing.
Is there a way to do this?
the way I have it right now is:
./load_data.sh TCOMPASS/Protocol >> load_semantic.log
Redirect standard error:
./load_data.sh TCOMPASS/Protocol >> load_semantic.log 2>/dev/null
Related
I want to be able to select a file or dir based on the TASK_ID.
Ideally like this
sbatch -o %a.log --array=1-10 script.sh data/%a
But %a is only meant to be used for log files, and can't be passed to the script at runtime.
In the docs $SLURM_ARRAY_TASK_ID is brought up. But that requires modifying the script because only then will that variable be set (not when I submit the job with sbatch)!
Is there really no nice way to do this?
Sorry for my noob question as I am very new to linux. Please consider the below linux command :
/opt/mongodb-mms-automation/bin/mongodb-mms-automation-agent
-f /etc/mongodb-mms/automation-agent.config
-pidfilepath /var/run/mongodb-mms-automation/mongodb-mms-automation-agent.pid
>> /var/log/mongodb-mms-automation/automation-agent-fatal.log 2>&1
According to my understanding >> redirects standard output to file and 2>&1 means that standard error will be redirected to the same location as standard output. So in the above case I expect the standard output and standard error both to be redirected to /var/log/mongodb-mms-automation/automation-agent-fatal.log.
But obviously this is not the case. I can see that all info / error messages are being redirected to a file /var/log/mongodb-mms-automation/automation-agent.log. Can someone please explain what error I am making in reading this command?
Regards,
Meena
Standard output and standard error are just default destinations; the program could be doing a number of things which will sabotage any attempts to save the logs by redirecting to a file:
It writes straight to the terminal output, such as /dev/pts/0.
It detects whether standard output/error are connected to a file or a terminal, and changes behaviour accordingly.
Anything else the application developer considered to be the most useful behaviour.
In other words, it's application specific. You're probably better off finding the logfile configuration setting and changing that if you really need to. Usually I find it's easier and safer to leave the defaults (since they may be handy for example for security reasons such as sandboxing) and instead pointing to the default location in whatever software is trying to process that file in some way.
I have a working shell script which calls another shell script to perform some action on some processes running on the server. This inner shell script sometimes prompt to enter the userid and password. If this happens I want to come out this inner script and want to perform kill -9 for the process. Can anyone please suggest on how to achieve this?
One more point, whatever my shell scripts does, I am recording this in a log file,so I assume when script prompts to enter userid and password, this info also get recorded in the log.So is their should be a way to check this in the log file.
I am working on Linux OS. Please check and advise.
You can kill your child script
after some timeout:
( cmdpid=$BASHPID; (sleep 10; kill -9 $cmdpid) & exec my-child-script )
In this case you will kill my-child-script after given period of time (10 sec).
You can't (easily) detect if you script is waiting for input (on standard input), the only working method is to use strace/ptrace, but it's too complex
and I don't think it's really worth it. The timeout-based approach seems to be by far more natural.
You can find here
some additional examples of this approach in this question:
Bash script that kills a child process after a given timeout
Regarding log files:
You can extract data from your log files using grep/sed. To make the answer more concrete, we need some extra data.
What would be the best way to conditionally run an init.d script on linux based on hostname? I'm working with New Relic and some of the servers simply don't need it installed, but they're all otherwise basic copies of one another. This is Ubuntu.
I've tried (and failed) to put in a host conditional but for the life of me I can't get it working. Threw exits in the top of the file as well as in the start function, but it seems to fire up every time. Without knowing completely how those scripts are fired I'm a little confused on how to alter it to not fire if it server name isn't something like production, etc.
Any guidance would be super helpful.
Put this at the top of the script you would like to disable:
if [ $(hostname) != "goodhost" ]
then
exit
fi
replacing "goodhost" with the actual name of the host where the script is supposed to run.
Does that solve the problem?
I know that the scheduler can be used to create a cron job, but in my case, that job involves accessing a url. Problem is, if I use WGET or a batch file, a window keeps popping up. Any suggestions on how to get passed this?
Create a batch file that does what you want. Let's say it's called doit.bat. Create a file doit.vbs in the same directory. It should have the following contents:
CreateObject("Wscript.Shell").Run """doit.bat""", 0, False
Set the scheduler to run doit.vbs.
Yes, indeed. I'd like to cross link you to a site, where this has been discussed while just pasting.
C:\> at [\\machine] HH:MM[A|P] [/every:day] "command"
Furthermore schtasks might be of help. You might want to use curl within a script. It has a specific "silent" function.