nmap

The LISH console simply provides a method to reach your Linode server out-of-band, and is not a distribution in itself that can have software installed. You can install nmap on a Linode disk after connecting with LISH (or even in memory while booted to Finnix/Rescue Mode), but it isn't possible to download nmap to LISH in the same sense that you can't download nmap to SSH.

If your Linode distro has nmap installed and you're trying to run it through LISH, don't forget that you have to login to the SSH service of your Linode when connecting. This will allow you to access the commands installed in your Linux distro. This guide has some useful information you may find helpful:

• https://www.linode.com/docs/guides/using-the-linode-shell-lish/