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Actually, typing random strings in the Finder does the equivalent of filename completion. (Discussion in comp.os.linux.misc on the intuitiveness of commands: file completion vs. the Mac Finder.)
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^__^ / (oo)\_______/ _________ (__)\ )=( ____|_ \_____ ||----w | \ \ \_____ | || || || ||
sort nome_do_ficheiro.txt | uniq -c