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<()diff <(cat A.txt | sed 's/\s//g' | sed 's/ //g') <(cat B.txt | sed 's/\s//g' | sed 's/ //g')works in my case. Though quite ugly...-i. Besidessed s/\(\s\| \)//gshould probably work (not sure about portability whatsoever).localecommand saysLANG=C.UTF-8,LC_CTYPE="C.UTF-8", ... I hadn't touched that setting before. Should I set locale to something else?