Ruptime
This gives you the uptime and system load of shell servers.
centos7 up 5+17:19, 1 user, load 0.21, 0.21, 0.19 debian up 5+16:42, 7 users, load 3.25, 3.30, 3.41 fedora up 5+21:50, 0 users, load 0.11, 0.07, 0.06 ftp up 2+13:53, 0 users, load 0.82, 1.00, 0.94 mint up 4:37, 0 users, load 0.05, 0.06, 0.07 mxlinux up 5+21:48, 0 users, load 0.08, 0.05, 0.07 radius up 5+21:48, 2 users, load 0.14, 0.09, 0.09 scientific7 up 2+16:52, 1 user, load 0.12, 0.11, 0.09 ubuntu up 5+21:48, 9 users, load 2.36, 2.86, 3.08 zorin up 5+16:41, 6 users, load 0.02, 0.06, 0.08