my shell script
#!/bin/bash
pm2 start server.js
my crontab task
* * * * * /home/ec2-user/abcd/test.sh > /home/ec2-user/cron.log 2>&1
What I got from the log:
home/ec2-user/abcd/test.sh: line 2: pm2: command not found
how to fix it?
Remark:
1.When I execute ./test.sh, it runs normally
2.which pm2 - shows
~/.nvm/versions/node/v14.16.1/bin/pm2
The problem may be because of that PATH environment variable hasn't been set when the cron job is being executed and this is why your shell script can't find pm2. You have to enter the complete address of pm2.
Example if pm2 is in /usr/bin/:
#!/bin/bash
/usr/bin/pm2 start server.js
Or you may want to just set PATH env before the command you want to execute in you shell script.
In normal, when you execute the program in you terminal, the environment variables are set properly. This is why you can run your shell script in your terminal without any problem.
Set the path command like mentioned in the other answer.
PATH="/usr/bin:/bin:/home/ec2-user/.nvm/versions/node/v14.16.1/bin"
Next, locate the path to your server.js file and add the pm2 start command with the path.
pm2 start /home/ec2-user/ .....your path to the file..... /server.js
Complete code:
#!/bin/bash
PATH="/usr/bin:/bin:/home/ec2-user/.nvm/versions/node/v14.16.1/bin"
pm2 start /home/ec2-user/ .....your path to the file..... /server.js
Related
I'm running a script from crontab in which I want to set the symbolic link for npx. It does some other things which are dependent on the npx command itself. Its running the script as expected on the giving time interval, but its giving me no result for command which npx or whereis npx. When I try to run the script from terminal directly these commands does generate the correct path.
Note that, crontab I'm using is under the root user privilege, i.e set with sudo crontab -e and verified with echoing whoami inside the script which generate 'root')
By default, crontab will run your cron jobs using sh which might be the reason you are getting no results.
Try to explicitly change the shell to your default shell by adjusting the crontab entry:
*/30 * * * * /bin/bash -c "/my_script.sh"
In this case I changed it to bash, you can change it to your desired shell.
I have a code that reads port number from environment variable or from config. Code looks like this
const port = process.env.PORT || serverConfig.port;
await app.listen(port);
To run app without defining environment variable, I run following yarn command.
yarn start:dev
This command works successfully in Linux shell and Windows command line.
Now, I want to pass environment variable. I tried following,
PORT=2344 yarn start:dev
This commands works successfully in Linux shell but failing in Windows command line. I tried following ways but couldn't get it to work.
Tried: PORT=2344 yarn start:dev
I got error: 'PORT' is not recognized as an internal or external command,
operable program or batch file.
Tried: yarn PORT=2344 start:dev
I got error: yarn run v1.17.3
error Command "PORT=2344" not found.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
Any idea please? I know, I can define environment variables from System Properties in Windows. But any way if I can do it from command line?
i'd suggest you use the NPM module called cross-env. it allows adding particular env variables on the command line regardless of platform. with that said, you may try:
$ cross-env PORT=2344 yarn start:dev
You can chain commands on the Windows command prompt with &(or &&). To set an environment variable you need to use the set command.
The result should look like this: set PORT=1234 && yarn start:dev.
Found a solution for this problem in Windows command prompt.
Create a .env file in project root folder (outside src folder).
Define PORT in it. In my case, contents of .env file will be,
PORT=2344
Run yarn start:dev
Application will use port number that you have specified in .env file.
Put .env file at root. Then following command will expose content of .env file and then run yarn start command
$ source .env && yarn start
or this command
$ export $(cat .env) && yarn start
If update any variable in .env then close the terminal and open new terminal window and can again run above command. Or else can also run unset command to remove existing var.
unset VAR_NAME
You can use popular package dotenv:
create a file .env in root directory
put all your env vars
e.g.:
ENV=DEVELOPMENT
run your code like this
$ node -r dotenv/config your_script.js
here the explanation:
[https://github.com/motdotla/dotenv#preload]
To define environment variables in the Windows command prompt we can use the set command, you can then split your call into two lines.
set PORT=2344
yarn start:dev
The set command persists within the current command prompt, so you only need to run it once.
The equivalent command in bash is 'export'.
FYI (not a direct answer). I was attempting this in VS Code - passing .env variables through yarn to a JavaScript app. Google had very few examples so I'm sharing this for posterity as it's somewhat related.
The following simply substitutes text normally placed directly into the package.json or script file. Use this to quickly obfuscate or externalize your delivery configurations.
In Environment Variable File (.env)
PORT=2344
In Yarn File (package.json)
source .env; yarn ./start.sh --port $PORT
In Yarn Script (start.sh)
#!/bin/bash
while [ $? != 0 ]; do
node dist/src/index.js $1; #replace with your app call#
done
The app then accepts port as a variable. Great for multi-tenant deployments.
I can't get to execute symfony command in bash script when I run it in cron.
When I execute the .sh script by hand everything is working fine.
in my bash file the command is executed like this:
/usr/bin/php -q /var/www/pww24/bin/console pww24:import asari $office > /dev/null
I run the scripts from root, the cron is set to root as well. For the test i set files permissions to 777 and added +x for execution.
the bash script executes fine. It acts like it's skipping the command but from logs i can see that the code is executed
It turned out that symfony system variables that I have stored on server are not enough. When you start to execute the command from command line its fine, but when using Cron you need them in .env file. Turned out that in the proces of countinous integrations I only got .env.dist file and I've to make the .env file anyways.
Additionaly I've added two lines to cron:
PATH=~/bin:/usr/bin/:/bin
SHELL=/bin/bash
and run my command like this from the bash file:
sudo /usr/bin/php -q /var/www/pww24/bin/console pww24:import asari $office > /dev/null
I have a build server. I'm using the Azure Build Agent script. It's a shell script that will run continuously while the server is up. Problem is that I cannot seem to get it to run on startup. I've tried /etc/init.d and /etc/rc.local and the agent is not being run. Nothing concerning the build agent in the boot logs.
For /etc/init.d I created the script agent.sh which contains:
#!/bin/bash
sh ~/agent/run.sh
Gave it the proper permissions chmod 755 agent.shand moved it to /etc/init.d.
and for /etc/rc.local, I just appended the following
sh ~/agent/run.sh &
before exit 0.
What am I doing wrong?
EDIT: added examples.
EDIT 2: Just noticed that the init.d README says that shell scripts need to start with #!/bin/sh and not #!/bin/bash. Also used absolute path, but no change.
FINAL EDIT: As #ewrammer suggested, I used cron and it worked. crontab -e and then #reboot /home/user/agent/run.sh.
It is hard to see what is wrong if you are not posting what you have done, but why not add it as a cron job with #reboot as pattern? Then cron will run the script every time the computer starts.
Just in case, using a supervisor could be a good idea, In Ubuntu 14 you don't have systemd but you can choose from others https://en.wikipedia.org/wiki/Process_supervision.
If using immortal, after installing it, you just need to create a run.yml file in /etc/immortal with something like:
cmd: /path/to/command
log:
file: /var/log/command.log
This will start your script/command on every start, besides ensuring your script/app is always up and running.
I have installed cgminer in my machine and could able to start it without any issues
when running ./cgminer in terminal.
But for a specific feature, i am trying to invoke the cgminer from
using shell script via a cron job.
1) The cgminer command executes correctly when i run the shell script
2) But it is not executing when i set the shell script as a cron job.
Below is the content in the shell script.
#!/bin/bash
export DISPLAY=:0.0
/root/test/cgminer/cgminer/cgminer >> /home/balan/temp/script/log.txt;
Please suggest.
Are you running this as a cronjob under the root user or the balan user? Since the cgminer binary is in the root directory this probably needs to run as root.
If you are running as root, try redirecting the error output and see what errors are being logged:
/root/test/cgminer/cgminer/cgminer >> /home/balan/temp/script/log.txt 2>/home/balan/temp/script/error_log.txt;
Solution :
The variable TERM has to be set as like below and respective host, username and password
to be given for the cgminer to execute from cronjob.
export TERM=xterm
#Change the below cgminer path - IMPORTANT
/root/test/cgminer/cgminer/cgminer -o $host -u $user -p $password