Ruptime
This gives you the uptime and system load of shell servers.
centos7 up 50+18:43, 2 users, load 0.34, 0.22, 0.19 debian up 34+13:59, 5 users, load 1.42, 1.00, 0.51 fedora up 50+23:11, 0 users, load 0.06, 0.10, 0.09 ftp up 5+17:25, 0 users, load 0.68, 0.57, 0.62 manjaro up 2+11:55, 0 users, load 0.00, 0.00, 0.00 mint up 45+06:01, 0 users, load 0.00, 0.01, 0.03 mxlinux up 50+23:12, 0 users, load 0.01, 0.04, 0.01 radius up 50+23:12, 1 user, load 0.13, 0.11, 0.09 scientific7 up 47+18:13, 1 user, load 0.00, 0.01, 0.00 ubuntu up 2+05:22, 3 users, load 0.23, 0.18, 0.12 zorin up 50+18:03, 7 users, load 0.05, 0.03, 0.00