(The Mac is basically Unix under the hood, so I use Bash as my shell in the Mac’s Terminal.) I also tried a GUI front end for ExifTool (not by the same developer) called pyExifToolGui, but I actually found that harder to use (and less powerful), especially for batch processing.

You can also use jpegtran from the independent jpeg group (ijg.org). It can rotate the jpeg data without re-encoding it.

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Don't most modern graphics, photo editing, and image cataloging applications know how to rotate a JPEG image in 90 degree increments without altering the underlying JPEG data? Do we really need special scripts or applications to do this?

You would think so, but for example if you rotate an image in Preview and then upload it to a website, the rotation doesn't take (and it recompresses). Not sure how it's working, but I used to have to use an exif utility when rotating. Lately I've gone back to using photoshop, which also does recompress.

I had sort of the opposite problem; photos taken looking down on a subject often had their EXIF rotation tag set incorrectly because of how I was holding the camera just before turning it to look down. I wrote a shell script called 'derotate' that used exiftool to fix the tag:
http://www.leancrew.com/all-this/2009/04/derotating-jpegs-with-exiftool/

My worry about rotating JPEGs in a graphics program is that the image will degrade because the JPEG compression is reapplied to the rotated image. The nice thing about exiftool is that you can look through the Perl code and see that it's affecting only the EXIF tags, not the image itself.

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If you are using iPhoto the suggested jpegtran is better than exiftool.
At least with iPhoto'08 if the orientation flag is set on an image then iPhoto will generate an internal 'edited' version with the image rotated, rather than simply display the original image rotated on-the-fly. While the original image is kept the internal one is also, doubling your disk usage.
Using jpegtran losslessly rotates the image data and iPhoto does not generate its internal 'edited' version.
You can use jpegtran to rotate images whose orientation flags are correct (i.e. if the orientation flag indicates image is rotated the data can be rotated and the orientation flag set to indicate no rotation). This has the dual benefit of saving disk space in iPhoto and supporting those programs which don't understand the orientation flag.

nperry wrote
If you are using iPhoto the suggested jpegtran is better than exiftool.
I searched for jpegtran for Mac OS X and could not find it ; could you give me a link ?
Thanks in advance