There are nice shell commands.

• check all JPEG files: for a in `find . -name "*.jpg"`; do djpeg < $a > /dev/null || echo BAD $a; done;. 5-17-03. Faster: djpeg is actually a faster decoder if you have -scale 1/8 (test 0.50 s to 0.11 s), and faster if you have -gr[ayscale] (test 0.50 s to 0.23 s), and also faster if you select the lower quality decode -fast (test 0.50 to 0.31 s) option. This command then for checking JPEG files can be quickened by changing "djpeg" to "djpeg -scale 1/8 -gr -fast" (test total 0.50 s to 0.10 s). The savings are large on a lot of files.

Privacy, security.

I like to cd to the directory above, then reach the final destination by a single name with no path.