Sysadmin

https://github.com/kahun/awesome-sysadmin

http://cfenollosa.com/misc/tricks.txt

http://sysadmincasts.com/

Bash strict mode https://news.ycombinator.com/item?id=8054440

http://www.opsschool.org/en/latest/monitoring_201.html

https://syscoding.com/

http://sysadmin.it-landscape.info/

http://overthewire.org/wargames/