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  • This breaks on empty lines... Commented Nov 18, 2015 at 7:23
  • it doesn't exactly break on empty lines, it just applies to them too. if you don't want to append \t whatever to empty lines, use sed -e 's/^.\+$/&\twhatever/' instead. or sed -e 's/^[A-Z0-9a-z]\+[[:space:]]\+[A-Z0-0a=z]\+$/&\twhatever/' Commented Nov 18, 2015 at 7:26
  • @cas I'll rephrase to accomodate your baseless nitpicking: "it produces unwanted output on emtpy lines, which in the real world is functionally equivalent to breakage." Commented Nov 18, 2015 at 7:29
  • it's not up to you to decide if it's "unwanted output". in some cases, that may be exactly what is wanted. saying that that is "broken" is, well, broken. Commented Nov 18, 2015 at 7:31
  • @jasonwryan: I didn't realize you had empty lines in your example, but I guess your transcript does. See my revised answer, which has two ways to do what you want. Commented Nov 18, 2015 at 7:33