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grep [A-Z] input.txtwould match every line of input.txt. How was input.txt created? What happens if you try to match another line, say `grep a input.txt'? Does that also match every line of input.txt?Bug fixessection of theNEWSfile for GNU grep 2.8 rather cryptically notes that "grep's interpretation of range expression is now more consistent with that of other tools. [bug present since multi-byte character set support was introduced in 2.5.2, though the steps needed to reproduce it changed in grep-2.6]" - maybe that gives you a lead?