Ruptime
This gives you the uptime and system load of shell servers.
centos7 up 13+01:43, 1 user, load 0.41, 0.14, 0.04 debian up 13+01:49, 12 users, load 1.44, 1.51, 1.55 ftp up 13+01:34, 0 users, load 6.18, 6.53, 6.44 mint up 13+01:50, 0 users, load 0.28, 0.20, 0.12 mxlinux up 13+01:46, 0 users, load 0.13, 0.18, 0.17 scientific7 up 13+01:43, 0 users, load 0.01, 0.02, 0.00 ubuntu up 13+01:59, 6 users, load 2.98, 3.07, 3.29 zorin up 13+01:44, 0 users, load 0.19, 0.21, 0.18