Ruptime
This gives you the uptime and system load of shell servers.
centos7 up 46+07:13, 2 users, load 0.00, 0.00, 0.00 debian up 30+02:29, 6 users, load 3.06, 3.23, 3.22 fedora up 46+11:41, 0 users, load 0.18, 0.18, 0.17 ftp up 1+05:55, 0 users, load 0.54, 0.52, 0.58 mint up 40+18:31, 0 users, load 0.15, 0.08, 0.08 mxlinux up 46+11:42, 0 users, load 0.04, 0.05, 0.07 radius up 46+11:42, 1 user, load 0.10, 0.06, 0.07 scientific7 up 43+06:43, 2 users, load 2.25, 2.37, 2.29 ubuntu up 16+17:34, 7 users, load 0.11, 0.13, 0.16 zorin up 46+06:33, 7 users, load 0.14, 0.10, 0.09