$ jpegoptim --strip-all *.jpg
CC_BY_NC-flickr_ericparker.jpg 140x140 24bit Adobe  [OK] 16772 --> 16315 bytes (2.72%), optimized.
CC_BY_NC_SA-flickr_manachar.jpg 140x140 24bit Adobe  [OK] 12604 --> 11913 bytes (5.48%), optimized.
CC_BY_NC_SA-flickr_seandreilinger.jpg 140x140 24bit Adobe  [OK] 16825 --> 16235 bytes (3.51%), optimized.
CC_BY_NC_SA-flickr_umhealthsystem.jpg 140x140 24bit Adobe  [OK] 15802 --> 15378 bytes (2.68%), optimized.