Ruptime
This gives you the uptime and system load of shell servers.
centos7 up 51+19:22, 3 users, load 0.21, 0.20, 0.27 debian up 35+14:38, 5 users, load 0.05, 0.07, 0.11 fedora up 51+23:50, 0 users, load 0.17, 0.20, 0.19 ftp up 6+18:04, 0 users, load 0.68, 0.54, 0.48 manjaro up 10:46, 0 users, load 0.01, 0.04, 0.00 mint up 46+06:40, 0 users, load 0.00, 0.01, 0.02 mxlinux up 51+23:51, 0 users, load 0.14, 0.14, 0.10 radius up 51+23:51, 1 user, load 0.15, 0.12, 0.09 scientific7 up 48+18:52, 2 users, load 3.48, 2.92, 1.99 ubuntu up 3+06:01, 2 users, load 0.35, 0.25, 0.19 zorin up 51+18:45, 7 users, load 0.00, 0.02, 0.00