EXIF information in JPEG

http://professionalsnapshots.com/blog/archives/41

sudo apt-get install libimage-exiftool-perl
sudo apt-get install exif

$exiftool -gps:GPSLatitude=122,00.0000 xxx.jpg (gps is group, GPSLatitude is tag name)
$exif xxx.jpg

Other option can be used for GPS(Geotag)
-GPSLongitudeRef=W/E
-GPSLongitude=dd,dd.dddd
-GPSLatitudeRef=N/S
-GPSLatitude=dd,dd.dddd
-GPSAltitude=ddddm

[Note]
exiftool -list --> show all available TAGs
exiftool -listg/-listg1 --> show available group
http://search.cpan.org/~exiftool/Image-ExifTool-7.67/lib/Image/ExifTool/TagNames.pod#EXIF_Tags