[ Thanks to Dmitri
Popov for this link. ]
“Need to quickly geotag a bunch of photos taken at a specific
location? ExifTool is your friend. Using this powerful command-line
tool, you can geotag multiple photos with a single command. Before
you proceed, make sure that ExifTool is installed on your machine.
To install ExifTool on Ubuntu, execute the sudo apt-get install
libimage-exiftool-perl command. Next, you have to obtain the
longitude and latitude of the desired geographical location, and
feed the coordinates to ExifTool as follows:”