[[Calendar, CallDav, CardDav etc]]

[[GIT, SVN]]

[[ Apache, nginx, etc, optimizations]]

[[MySQL, MariaDB]]

[[Memcache]]

[[Redis]]

[[Samba]]

[[SD_Plus]]

[[Let's Encrypt]]

[[Email]]

[[Nmap]]

[[Squid]]

[[GPG]]

[[IPMI iDRAC iLO]]

[[Networking]]

[[DNS]]

[[Grunt, Gulp, and other building tools]]

[[Hosting panles]]

[[FS tricks]]

[[Expect]]

[[ImageMagick]]

[[Word, Excel and other MS]]

[[Moodle]]

[[Zabbix]]

[[:Programming:start]]

[[H A С K]]

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