Linux / Unix Command To Optimize and Compress PNG Files In Bulk

One way to optimize and compress PNG files in bulk is by using the optipng command line tool. Here's an example of how to use it:

$ for file in *.png; do optipng -o7 "$file"; done

This will optimize all PNG files in the current directory using level 7 optimization. The resulting files will be smaller in size while retaining the original quality.