http://vim.101hacks.com/

https://linux.101hacks.com/toc/

https://www.theunixschool.com/

https://catonmat.net/top-ten-one-liners-from-commandlinefu-explained

https://catonmat.net/the-next-ten-one-liners-from-commandlinefu-explained

https://catonmat.net/another-ten-one-liners-from-commandlinefu-explained

https://catonmat.net/yet-another-ten-one-liners-from-commandlinefu-explained

https://www.thegeekstuff.com/sed-awk-101-hacks-ebook/

https://mywiki.wooledge.org/BashFAQ

http://bash.cumulonim.biz/BashPitfalls.html