nvm.fish:tldr:c6725

This command is used to set the default version of Node.js (or the Node Version Manager, NVM) to a specific version designated by the variable ${node_version}.

Here is a breakdown of the command:

• set: This is a command used to set a value to a specific variable or parameter.
• nvm_default_version: This is the name of the variable that will hold the default version of Node.js.
• ${node_version}: This is a placeholder/variable that represents a specific version number of Node.js. The actual version number will be assigned to this variable, and then it will be used to set the value of nvm_default_version.

In summary, this command sets the default version of Node.js (using NVM) to the value specified in the ${node_version} variable. The actual value of ${node_version} would need to be defined elsewhere in the script or command before using this command.