How can I get R to read my environment variables?

Jordan Bell

I'm running R on an EC2 spot instance and need R to terminate the instance and cancel the spot request after the script runs.

For this I have set the "request id" in an environment variable /.bashrcand my plan is to simply call the following code into R once the script is ready

system("ec2-cancel-spot-instance-requests $SIR")

The problem I'm having is that R can't "see" the same environment variables that I see when typing envfrom outside R , so the command doesn't work.

I've checked and I /etc/environmentcan see the variables if I set the environment variable to R, but that's another question. Since these variables are dynamic (the instance ID and request ID are different each time a Spot Instance is created), I am running a script to create them in the form:

export SIR=`cat /etc/ec2_instance_spot_id.txt`

The file contains the location of the dynamic ID

So, how to insert "dynamic" environment variables /etc/environment? Alternatively, how do I get R to read environment variables /.bashrc?

Any hints in the right direction would be greatly appreciated!

Dirk Edby Bootle:

You want to Sys.getenv()be there Sys.getenv("PATH"), say.

Or take your example as an example

SIR <- Sys.getenv("SIR")   
system(paste("ec2-cancel-spot-instance-requests",  SIR))

As for setting variables at startup, see help(Startup)Understanding ~/.Renvironmentetc.

How can I customize my Service Worker based on environment variables?

Madbarron: Edit: This looks like a duplicate of this open question . Do I mark this as answered or delete? I'm using InjectManifest in workbox-webpack-plugin inside a Vue CLI 3 app. The custom service worker I'm injecting already handles Firebase Cloud Messagi

How can I read my Google location history in R

Ajay Ohri I found my Google Location History at https://maps.google.co.uk/locationhistory/b/0/?hl=zh-CN Then, I downloaded the KML file I installed rgdalit correctly, but I can't read the file I put the file name and layer name in https://gis.stackexchange.com

How can I get the environment specific URL in my AngularJS controller?

CodeWarrior condition The root URL of our web project in production is as follows: http://example.com. Our local dev instance (don't ask me why) uses the following URL by default: http://localhost/SubDirSubDir is a placeholder for the actual virtual subdirecto

How can I read Windows' environment variables from php using the built-in web server?

username I use Azure to deploy my code, so I use the server's variables to hold important settings (such as client_id and client_secrets). $_SERVER['APPSETTING_Imgur_Client_Id']; Set Azure Application Environment Variables Azure $ _SERVER I would like to use t

How can I read my Google location history in R

How can I get sudo to read my ~/.gemrc file?

Dave I'm using Ruby on Rails 5 on Debian Linux, Apache and Passenger. I created the file ~/.gemrc gem: --no-rdoc --no-ri However, I am running the command sudo bundle install And it doesn't seem to accept the above. How do I get "sudo" to recognize my "~/.ge

How can I configure the package.json file to read from the set of environment variables in the OS?

Dave I am using React 16.12.0. I have the following "proxy" configured in package.json { "name": "client", "version": "0.1.0", "private": true, "dependencies": { "@testing-library/jest-dom": "^4.2.4", "@testing-library/react": "^9.4.0", "@t

How can I configure the package.json file to read from the set of environment variables in the OS?

How can I customize my Service Worker based on environment variables?

How can I read my Google location history in R

How can I read Windows' environment variables from php using the built-in web server?

How can I make sudo keep my environment variables?

aknuds1 Using sudo 1.7.4p4 on Solaris 5.10 and sudo 1.6.7p5 on RHEL4 u6, I don't see how to preserve environment variables such as $PYTHONPATH. I've added this line to sudoers but it doesn't make any difference: Defaults !env_reset Am I doing something wrong,

How can I set dbUrl, other constants as environment variables for my .net core 2.2 project and how can I read these constants in my .net core 2.2 application?

Farhad Hassan | I have .net core 2.2application that I have to set and other constants dbUrlin my project to sue environment variables. I don't know what should I do. I have some questions 1) How do I set these variables as variables environmentfor the .net co

How can I make MPI worker nodes read their own environment variables?

Lauren I'm using OpenMPI and mpirun, and my MPI process is distributed into multiple Docker containers. Each Docker container runs its own process, which has an environment variable such as FOO, where $FOO(ie, its value) varies from container to container. The

How can I read my Google location history in R

How can I pass variables from my post to my get?

programmer man I am using react/express. I have a simple web page that takes user input and uses axios.post. In my backend, I need to create a file in my get. I haven't been able to get the return function to work, I don't want to use a global variable as it h

How can I display all environment variables stored in my UNIX?

Ganesh Dogiparthi Is there any command to display all environment variables stored in my Unix? coffee cup You can use printenvor env. See the difference in this post: What is the difference between "env" and "printenv"?