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Expand permissions issues coverage (#790)

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@ -37,10 +37,15 @@ If you already have Node.js installed, an easy way to install `n` is using `npm`
npm install -g n
The `n` command downloads and installs to `/usr/local` by default, but you may override this location by defining `N_PREFIX`.
The default root location used when running `n` is `/usr/local` where a normal user does not have write permission. You may strike the same sort of permission error when using npm to install global modules, like the above command. You have three main options:
1) change the ownership of the relevant directories to yourself (see below)
2) tell `n` to use a custom location where you do have write permissions (see `N_PREFIX`)
3) put `sudo` in front of the command to run it as super user
`n` caches Node.js versions in subdirectory `n/versions`. The _active_ Node.js version is installed in subdirectories `bin`, `include`, `lib`, and `share`.
To avoid requiring `sudo` for `n` and `npm` global installs, it is suggested you either install to your home directory using `N_PREFIX`, or take ownership of the system directories:
To take ownership of the system directories (option 1):
# make cache folder (if missing) and take ownership
sudo mkdir -p /usr/local/n