I have added a new package to ELPA that provides subtle zebra striping or green bars to comint output. It is a minor mode for use in `comint' derived buffers.
I have been using a version of this for many years and find it very useful in tracking output from shells and SQL command line tools with `truncate-lines' enabled when scrolling left and right.
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MICHAEL@MAUGER.COM // FSF and EFF member // GNU Emacs sql.el maintainer