Old school programmer who likes to code, test and try.
My Favorites:
Use and replace special non ascii double quotes like U+201c
& U+201d
http://stackoverflow.com/questions/43458809/escaping-double-quotation-marks-in-sed/43461815#43461815
https://unix.stackexchange.com/questions/359832/converting-csv-to-tsv#360053
http://stackoverflow.com/questions/43552221/using-awk-sed-to-parse-replace-inline/43552817#43552817 (xml tags replacement)
https://unix.stackexchange.com/questions/367705/how-to-print-x-lines-before-and-y-lines-after-zth-line/367736#367736 Print a range of lines techniques & Benchmarks
Also: https://unix.stackexchange.com/questions/47407/cat-line-x-to-line-y-on-a-huge-file
comparing two files line by line using comm and diff: https://unix.stackexchange.com/questions/377659/comparing-two-files-line-by-line/377670?noredirect=1#comment671258_377670