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grep file sizes

for nxn in * ; do identify $nxn | grep -oE '([0-9]*)x([0-9]*)[[:space:]]' >> list-sizes.txt; done

grep file sizes and names

for nxn in * ; do identify $nxn | echo $nxn `grep -oE '([0-9]*)x([0-9]*)[[:space:]]'` >> list-sizes-names.txt ;done