This can be useful for masses of images editing. I needed to change the filenames of my photos to bring them in order for the popular german online print image service PosterXXL. To have all my photos ordered by specific locations, they needed ascending numeric filenames. Here I have stumbled upon useful console commands.
Rename all files to a number plus the current timestamp
ls | cat -n | while read n f; do mv "$f" "file-$(date +%s)-$n.jpg"; done
Change the last edit date of all files in a folder - not the filenames, but in the meta-information of the files
find -print | while read filename; do touch -d "2 hours ago" "$filename"; done