Ruptime
This gives you the uptime and system load of shell servers.
centos7 up 5+06:49, 2 users, load 0.09, 0.04, 0.00 debian up 6+09:27, 12 users, load 0.39, 0.37, 0.36 eskimo up 11+16:08, 1 user, load 1.62, 1.45, 1.29 fedora up 5+06:36, 0 users, load 0.02, 0.07, 0.06 ftp up 14:59, 0 users, load 55.38, 48.69, 50.84 julinux up 6+09:36, 0 users, load 0.04, 0.17, 0.16 manjaro up 6+09:28, 0 users, load 0.56, 0.69, 0.72 mint up 6+09:28, 0 users, load 0.18, 0.28, 0.23 mxlinux up 6+09:15, 0 users, load 0.04, 0.03, 0.03 scientific7 up 6+08:50, 0 users, load 0.02, 0.02, 0.00 ubuntu up 2+06:31, 8 users, load 2.81, 2.71, 2.76 zorin up 6+09:18, 0 users, load 0.26, 0.26, 0.21