(0) Introduction unix philosophy: small utilities combine to do large tasks files and streams redirection and piping grep shell scripting (1) byte oriented filtering cat and tac head and tail od (and hexdump) HERE documents (2) line oriented filtering cut expand and unexpand fold fmt nl tr (multi panels?) (3) file oriented processing sort tsort ?tsort#2: dependency lists uniq pr (4) combining and spliting multiple files comm join paste split csplit (5) summarizing and identifying files wc ptx cksum and sum md5sum (in bsd: md5) and sha1sum crytographic and ordinary collision resistance (6) working with log files extracting ip addresses of website visitors counting occurences finding the most frequent visitors generate new ad hoc report cut by regex correlating server logs (join) (7) working with documentation (6) Resources