Rename According to Image or Video Metadata

README.md

Bash one-liners to rename images or videos according to metadata (date or dimensions)

Pictures

jhead -nIMG_%Y%m%d_%H%M%S *.jpg

Short and simple, jhead takes a format string after the -n CLI flag. It only works with JPEGs though. On Ubuntu 16.04, install the jhead package.

Videos

for i in *.3gp; do mv -i "$i" "$(exiftool -CreateDate "$i" | awk -F ': ' '{print $2}' | sed -e 's/:/-/g' -e 's/ /_/g').3gp"; done

Breakign it down, here's what's run in the loop:

mv -i "$i" "$(exiftool -CreateDate "$i" | awk -F ': ' '{print $2}' | sed -e 's/:/-/g' -e 's/ /_/g').3gp"

exiftool can be installed on Ubuntu 16.04 by installing the libimage-exiftool-perl package. Don't know about other versions or distors.
exiftool -CreateDate "$i" prints the date the video was filmed. This is piped to awk and sed for manipulation, which I didn't write myself. This one-liner is heavily based on this Ask Ubuntu answer: http://askubuntu.com/a/346025/289003

Moving pictures to directories named by the dimensions

In other words, a 100x100 image will be put in a directory named 100x100.

for file in *.jpg; do mkdir `identify -format '%wx%h' $file`; cp -i $file `identify -format '%wx%h' $file`/$file; done

Breaking it down to the body of the loop:

do mkdir `identify -format '%wx%h' $file`; cp -i $file `identify -format '%wx%h' $file`/$file

You'll notice identify -format '%wx%h' $file is in there twice. That's because cp doesn't create the directory it's copying to if it doesn't exist. So first mkdir makes the directory. This fails as soon as a second image with the same dimensions is found: mkdir: cannot create directory ‘100x100’: File exists. We could check if the directory existed first, but this was a one-off. Also, instead of running identify -format '%wx%h' $file twice, it would be better to store it in a variable. But again, it's a one-off and I'm bad at shell scripting.
For the identify command you'll need ImageMagick.
This one-liner is heavily based on this SO answer: http://stackoverflow.com/a/4884707/3714913

Final Note

I wrote this mostly for a personal reference. As is, it's not very flexible or informative. Feel free to ask questions.