# example: all files like
# my-filename-600x150.jpg
# my-other_filename-1000x1530.jpg
ls | grep -P "(.*)[1-9]{1}[0-9]{2,3}x[1-9]{1}[0-9]{2,3}.jpg" | xargs -d"\n" rm
# ls -> list
# grep -P "" -> Regex Filter
# xargs -d"\n" -> List to string
# rm -> remove
# Source: https://superuser.com/questions/392872/delete-files-with-regular-expression
Example: Remove all thumbnails generated by WordPress
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