Ruptime
This gives you the uptime and system load of shell servers.
centos7 up 5+09:04, 1 user, load 0.23, 0.12, 0.10 debian up 5+08:24, 6 users, load 4.01, 3.92, 3.73 fedora up 5+13:32, 0 users, load 0.12, 0.10, 0.09 ftp up 2+05:35, 0 users, load 7.88, 6.47, 5.98 mint down 5+15:31 mxlinux up 5+13:33, 0 users, load 0.06, 0.08, 0.08 radius up 5+13:30, 2 users, load 0.09, 0.09, 0.08 scientific7 up 2+08:34, 1 user, load 0.00, 0.02, 0.00 ubuntu up 5+13:30, 10 users, load 4.02, 3.36, 3.03 zorin up 5+08:23, 7 users, load 0.08, 0.09, 0.08