AWS Cloud9 environment construction Update Ruby to the latest stable version

I am using "RVM" which is pre-installed in Cloud9 environment.

Check the latest stable version of Ruby today

You can check it on the official website. Ruby download page As of June 3, 2020, the latest stable version was 2.7.1.

Check the version of Ruby installed in the Cloud9 environment

The list command displays a list of installed (switchable) Ruby versions. rvm list The version included by default was not 2.7.1, so install it additionally.

Display a list of Ruby versions that can be installed with RVM

rvm list known A list of installable Ruby versions is displayed. The part enclosed in [] is the part that can be omitted when specifying the version. The MRI list did not include the version "2.7" of Ruby I wanted to install. In this case, RVM needs to be updated. Update RVM on AWS Cloud9 --Qiita

Note: MRI (Matz'Ruby Implementation) is the most common Ruby processing system.

Install Ruby by loosely specifying the version

To install version 2.7, enter the command as follows: rvm install 2.7

After processing, check if the installation was successful. rvm list Shows a list of Ruby versions installed in. Installation is complete.

You can also check the current version with the ruby command. ruby -v

Install Ruby by specifying the version in detail

The writing method is the same as when specifying loosely. To install version 2.3.1, enter the command as follows. rvm install 2.3.1 Press the Enter key to start the installation.

Check if it was installed. rvm list You can see that 2.3.1 has been added.

Meaning of symbols

=> --current (current version of Ruby) = * --current && default (currently in use and default version)

• --default (default version)

Switch the version of Ruby you are using

rvm use <version>

For example, to use 2.7.0, execute the following command. rvm use 2.7.0

To check if it has switched, use rvm list. The version currently in use is selected with "=>" or "= *".

You can also check the current version with the ruby command. ruby -v

Set the version of Ruby to use by default

Command to set 2.7.0 as the default rvm --default use 2.7.0

Check with rvm list The default mark is marked with "*".

Remove the installed Ruby

rvm remove <version>

Enter the version you want to remove and run the command. rvm remove 2.3.8

When the process is finished rvm ls If it disappears from the list with, you can confirm that it has been deleted.