Ruptime
This gives you the uptime and system load of shell servers.
centos7 up 22:04, 2 users, load 0.07, 0.02, 0.00 debian up 22:36, 8 users, load 0.16, 0.28, 0.28 eskimo up 6+05:15, 1 user, load 1.13, 1.22, 0.80 fedora up 22:01, 0 users, load 0.20, 0.16, 0.10 ftp up 22:34, 0 users, load 2.94, 3.34, 3.26 julinux up 22:45, 0 users, load 0.14, 0.10, 0.09 manjaro up 22:34, 0 users, load 0.63, 0.69, 0.73 mint up 22:34, 0 users, load 0.24, 0.14, 0.10 mxlinux up 22:24, 0 users, load 0.10, 0.06, 0.01 scientific7 up 21:56, 0 users, load 0.05, 0.01, 0.00 ubuntu up 22:36, 8 users, load 0.42, 0.35, 0.33 zorin up 22:24, 0 users, load 0.08, 0.17, 0.13