other:start

Calendar, CallDav, CardDav etc

Apache, nginx, etc, optimizations

Grunt, Gulp, and other building tools

Word, Excel and other MS

https://www.digitalocean.com/community/tutorials/how-to-manage-etc-with-version-control-using-etckeeper-on-centos-7

https://www.webhostface.com/kb/knowledgebase/examples-using-wget/

https://stackoverflow.com/questions/17998978/removing-colors-from-output

https://unix.stackexchange.com/questions/162607/date-command-going-back-one-or-two-days-seeing-different-flags