Connect to preconfigure ssh hosts (set in ~/.ssh/config) via simple list with numbers

sshhosts

#!/usr/bin/env bash

get_hosts="cat ~/.ssh/config  | grep Host\\\\s | awk '{ print \$2 }' | sort -u"

if [[ $# -eq 0 ]] ; then
	eval "$get_hosts | nl -ba"
	exit;
fi

host_num=$1

re='^[0-9]+$'
if ! [[ $host_num =~ $re ]] ; then
	echo "error: Not a number" >&2
	exit 1
fi

host=$(eval "$get_hosts | sed -n '${host_num}p'")

if [[ -z $host ]] ; then
	echo "Error: invalid host number" >&2
	exit 1
fi

echo "Connecting $host"

ssh $host