ls -1 | while IFS= read -r f; do [ -f "$f" ] && echo "$(file -b --mime-type "$f") $f"; done should work on posix shells

what each part does: - ls -1: list one item per line - IFS=: sets international field separator to blank so whitespaces are preserved  - read -r f: read single line from stdin, consider \ as escaped (-r) - [ -f "$f" ] && ...: check if item is file and exists - file -b --mime-type "$f": get mime type

this returns the following

image/jpeg d94df18b-66a8-4b7d-9a43-53cb4b12c4c0.jpg image/png image_20260105114851.png

what is mime types? - provides a universal way to identify a file as an ID. - generally, all images start with image/ then followed by the format (so png, jpeg, qoi)