#!/bin/bash set -e fnm install 6.11.3 fnm install 8.11.3 fnm alias 8.11.3 oldie fnm alias 6.11.3 older VERSIONS_INSTALLED=$(fnm ls) echo "$VERSIONS_INSTALLED" | grep 8.11.3 | grep oldie echo "$VERSIONS_INSTALLED" | grep 6.11.3 | grep older