How to Fix zsh: command not found: R Error on macOS When Installing rJava

Описание: Struggling with `R CMD javareconf` command not found error on macOS? Here’s a step-by-step guide to resolve it and successfully install `rJava`.
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This video is based on the question https://stackoverflow.com/q/67324807/ asked by the user 'Thomas' ( https://stackoverflow.com/u/3033963/ ) and on the answer https://stackoverflow.com/a/67452876/ provided by the user 'Yuri Broze' ( https://stackoverflow.com/u/2093929/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Solving the zsh: command not found: R Error on macOS for rJava Installation

If you've attempted to install rJava and faced a frustrating error message stating zsh: command not found: R, you are not alone. This issue typically arises due to the R installation on macOS, particularly in newer versions like Big Sur with the Apple M1 Chip. In this guide, we will walk you through the cause of this issue and provide a detailed solution to get your R environment up and running.

Understanding the Issue

The underlying problem is associated with a bug in the CRAN's R installation package that affects creating symbolic links for command-line use of R and Rscript. This bug typically occurs when the operating system's release version is 20 or above, which includes macOS Big Sur and subsequent releases. Consequently, even after installing R, you may find that the command line cannot locate the R executable, resulting in errors when you try to run commands like R CMD javareconf.

Steps to Resolve the Issue

Step 1: Verify Your macOS Version

First, it’s essential to confirm your macOS version, as this issue primarily affects versions 20 and up. You can check this by running the following command in your terminal:

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If the output indicates a version over 20, proceed to the next step.

Step 2: Create Symbolic Links Manually

The error arises because the symbolic links to R and Rscript that the installation process should create are missing. You can manually create these links using the following instructions.

Open your terminal.

Create the directory for symbolic links if it doesn't exist:

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Navigate to the local bin directory:

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Remove any existing links and create new ones:

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These commands will link the R and Rscript executables to the /usr/local/bin directory, making them accessible from the command line.

Step 3: Test the Installation

Once the symbolic links are created, test to see if R is now recognized by the terminal:

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If you see the version of R displayed without an error, you're good to go! You can now proceed with your rJava installation using the command:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By following these steps, you should be able to resolve the zsh: command not found: R error on macOS and successfully install rJava. This issue, while annoying, can be fixed easily by creating the necessary symbolic links. If the problem persists, consider filing a bug report with the R-project to help improve future installations. Happy coding with R!