My current faves, far from exhaustive - tac: for very large log files - emacs: remote file editing, regex replace across matching files, macros, rectangle cut/p

My current faves, far from exhaustive - tac: for very large log files - emacs: remote file editing, regex replace across matching files, macros, rectangle cut/paste, ... - xargs -P <n>: use all the cores! for fanning work out across a pool of <n> processes; web scraping, processing lots of files at once - docker: fast, precise and resusable image building