Ruptime
This gives you the uptime and system load of shell servers.
centos7 up 52+20:28, 3 users, load 0.53, 0.28, 0.20 debian up 36+15:41, 4 users, load 0.42, 0.32, 0.26 fedora up 53+00:56, 0 users, load 0.13, 0.19, 0.18 ftp up 7+19:10, 0 users, load 0.39, 0.57, 0.56 manjaro up 1+11:52, 0 users, load 0.00, 0.00, 0.00 mint up 47+07:43, 0 users, load 0.21, 0.10, 0.06 mxlinux up 53+00:57, 0 users, load 0.09, 0.06, 0.07 radius up 53+00:54, 1 user, load 0.13, 0.11, 0.09 scientific7 up 49+19:58, 2 users, load 2.66, 2.59, 2.45 ubuntu up 4+07:07, 5 users, load 0.14, 0.16, 0.17 zorin up 52+19:48, 7 users, load 0.00, 0.05, 0.04