I need to check in ubuntu terminal if process node is running so that i can use two different commands then if is running or not.
i try copy paste this code in ubuntu terminal:
if pgrep -x "node" > /dev/null then echo "Running" else echo "Stopped" fi
in terminal i get only > and no output...and i was expacting to output: Running or Stopped
But it stucks on >
How can i check in terminal without using external sh file to get information if node process is running or not? I im executing this in node ssh command on another server so i try copy paste this code on my server local but is not go.
You've got three missing semicolons:
if pgrep -x "node" > /dev/null; then echo "Running"; else echo "Stopped"; fi
Related
I can run a local script on a remote server using the -s option, like so:
# run a local script without nohup...
ssh $SSH_USER#$SSH_HOST "bash -s" < myLocalScript.sh;
And I can run a remote script using nohup, like so:
# run a script on server with nohup...
ssh $SSH_USER#$SSH_HOST "nohup bash myRemoteScript.sh > results.out 2>&1 &"
But can I run my local script with nohup on the remote server? I expect the script to take many hours to complete so I need something like nohup. I know I can copy the script to the server and execute it but then I have to make sure I delete it once the script is complete, would rather not have to do that if possible.
I've tried the following but it's not working:
# run a local script without nohup...
ssh $SSH_USER#$SSH_HOST "nohup bash -s > results.out 2>&1 &" < myLocalScript.sh;
You shouldn't have to do anything special - Once you kick off a script on another machine, it should finish running even if you terminate the connection:
For example
ssh $SSH_USER#$SSH_HOST "bash -s > results.out 2>&1" < myLocalScript.sh &
# Please wait a few seconds for the connection to be established
kill $! # Optional: Kill the last process
If you want to test it, try a simple script like this
# myLocalScript.sh
echo 'File created - sleeping'
sleep 30
echo 'Finally done!'
The results.out file should immediately be created on the other machine with "File created - sleeping" in it. You can actually kill the local ssh process with kill <your_pid>, and it will still keep running on the other machine, and after 30 seconds, print "Finally done!" into the file, and exit.
I've set up a simple init.d script "S3logrotate" to run on shutdown. The "S3logrotate" script works fine when run manually from command line but the script does not function correctly on shut down.
The script uploads logs from my PC to an Amazon S3 bucket and requires wifi to run correctly.
Debugging proved that the script is actually run but the upload process fails.
I found that the problem seems to be that the script seems to run after wifi is terminated.
These are the blocks I used to test my internet connection in the script.
if ping -q -c 1 -W 1 8.8.8.8 >/dev/null; then
echo "IPv4 is up" >> *x.txt*
else
echo "IPv4 is down" >> *x.txt*
fi
if ping -q -c 1 -W 1 google.com >/dev/null; then
echo "The network is up" >> *x.txt*
else
echo "The network is down" >> *x.txt*
fi
The output for this block is:
IPv4 is down
The network is down
Is there any way to set the priority of an init.d script? As in, can I make my script run before the network connection is terminated? If not, is there any alternative to init.d?
I use Ubuntu 16.04 and have dual booted with Windows 10 if that's significant.
Thanks,
sganesan7
You should place you scrip in:
/etc/NetworkManager/dispatcher.d/pre-down.d
change group and owner to root
chown root:root S3logrotate
and it should work. If you need to do this for separate interface place script in
create a script inside
/etc/NetworkManager/dispatcher.d/
and name it (for example):
wlan0-down
and should work too.
The following ssh command does not return to terminal. It hangs though the execution is completed. The execution hangs after echo hi command.
ssh user#testserver "echo hello;source .profile;source .bash_profile;/apps/myapp/deploytools/ciInstallAndRun.sh; echo hi"
Output
hello
<outoutfrom remote script"
hi
ciInstallAndRun.sh
echo 'starting'
cd /apps/myapp/current
./tctl kill
cd /apps/myapp
mv myapp_v1.0 "myapp_v1.0_`date '+%Y%m%d%H%M'`"
unzip -o /apps/myapp/myappdist-bin.zip
java -classpath .:/apps/myapp/deploytools/cleanup.jar se.telenor.project.cleanup.Cleanup /apps/myapp myapp_v1.0_ 3
cd /apps/myapp/myapp_v1.0
echo 'Done with deploy'
chmod -R 775 *
echo 'Done'
./tctl start test
Source OS: Redhat
Dest Os: Solaris 10 8/07
Any idea to fix this.
Any idea to fix this.
Your installation script has spawned a child process.
Add a ps -f or ptree $$ command before echo hi. You'll see a child process or multiple child processes spawned by your install script.
To stop the SSH command from hanging, you need to detach such child process(es) from your terminal's input/output. You can sedirect your script's output to a file - both stdout and stderr with > /some/output/file 2>&1, and also redirect its input with < /dev/null.
Or you can use the nohup command.
You haven't provided an MCVE, as others have noted, but this is likely the problem command in you install script, since your question implies that you see the expected output from your install script:
./tctl start test
You probably would do better to replace it with something like:
./tctl start test </dev/null >/some/log/file/path.log 2>&1
Alright, so I have a .sh file that I run that will launch my server with the certain specifics that I'm looking for. It launches the server through screen into it's own screen. Here's the code for my run.sh file.
#!/bin/bash
# run.sh
# conversion of run.bat to shell script.
echo "Protecting srcds from random crashes"
echo "Now launching Garrys Mod RequiemRP"
sleep 5
screen -A -m -d -S gmserver ./srcds_run -console -game garrysmod +maxplayers 32 +map rp_downtown_v6 -autoupdate
echo "Server initialized. Type screen -x to resume"
Usually I use a batch file to do this, but I'm now using linux for my server hosting. Part of that batch file was if srcds (the server itself) were to crash, the run.bat file would restart the server automatically. I'm looking to do this with my run.sh file, but I'm unsure how to.
Perhaps you could make a service or script that will periodically check if the process is running. This will check if it's on and if it isn't, it will turn it on when executed.
#!/bin/bash
ps cax | grep srcds > /dev/null
if [ $? -eq 0 ]; then
exit
else
bash /path/to/run.sh
fi
I tested the command and it works. For my virtualized debian 9 system.
Here is what I'm entering in Terminal:
curl --silent https://raw.githubusercontent.com/githubUser/repoName/master/installer.sh | bash
The WordPress installing bash script contains a "read password" command that is supposed to wait for users to input their MySQL password. But, for some reason, that doesn't happen when I run it with the "curl githubURL | bash" command. When I download the script via wget and run it via "sh installer.sh", it works fine.
What could be the cause of this? Any help is appreciated!
If you want to run a script on a remote server without saving it locally, you can try this.
#!/bin/bash
RunThis=$(lynx -dump http://127.0.0.1/example.sh)
if [ $? = 0 ] ; then
bash -c "$RunThis"
else
echo "There was a problem downloading the script"
exit 1
fi
In order to test it, I wrote an example.sh:
#!/bin/bash
# File /var/www/example.sh
echo "Example read:"
read line
echo "You typed: $line"
When I run Script.sh, the output looks like this.
$ ./Script.sh
Example read:
Hello World!
You typed: Hello World!
Unless you absolutely trust the remote scripts, I would avoid doing this without examining it before executing.
It wouldn't stop for read:
As when you are piping in a way you are forking a child which has been given input from parent shell.
You cannot give the values back to parent(modify parent's env) from child.
and through out this process you are always in parent process.