# get exiftool
sudo apt-get install libimage-exiftool-perl
# get libexif CLI tool
sudo apt-get install exif
# erase all metadata
exiftool -all='' img.jpg
# see what metadata tags your photo has
exif -l img.jpg
# see the values of the included metadata tags
exif img.jpg
EXIF specifications: http://www.exif.org/specifications.html
For PNGs: http://pmt.sourceforge.net/pngmeta/index.html
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