Some years ago, I wrote a little utility called "sel", short for "select" (to avoid confusion with bash's "select" builtin).
It's more or less SQL's "select" statement for the command line, reading structured data on stdin and writing structured data on stdout, optionally filtering rows (like a structured-data-savvy grep) and creating / removing / reordering columns and changing the format. For instance, it could read CSV in and write tab-delimited...
