nvs <module.js> [args...]
nvs run <module.js> [args...]
nvs run auto <module.js> [args...]
nvs <version> <module.js> [args...]
nvs run <version> <module.js> [args...]
Runs a node module using a specified node version, without changing the caller's PATH.
If no version (or "auto") is specified, NVS searches for the nearest .node-version file in the current directory or parent directories. If found, the version specified in the file is then downloaded (if necessary) and used to run the module. If no .node-version file is found, then the current version of node is used to run the module; if there is no current version then the default (linked) version, if any, is used to run the module.