rename_pics.sh is a script to manually rename batches of pictures, displaying each picture and prompting the user for a name to use. By default and intention, it uses
feh to interact with the user in a graphical session, but it is capable of using any image viewer that can be invoked
viewer $FILE and may be run in a terminal by changing the correct option in the script (or running without
DISPLAY set, but that only works if you have an image viewer that doesn't need X).