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Old school programmer who likes to code, test and try.
My Favorites:
http://stackoverflow.com/questions/42239179/fastest-way-to-find-lines-of-a-text-file-from-another-larger-text-file-in-bash
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/362647/search-for-a-string-on-success-search-for-nearest-pattern/362721#362721 (xml part2)
http://stackoverflow.com/questions/17908555/printing-with-sed-or-awk-a-line-following-a-matching-pattern/17914105#17914105
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
https://stackoverflow.com/help/someone-answers