[EMAIL PROTECTED] wrote: > grep -o [1234567890]* grepbug-onlymatching.txt
It is indeed puzzling that the above doesn't produce any output. But in a sense the -o and the * are conflicting: the [1234567890]* will match anything, also zero digits, and the -o should then print all these occurrences of zero digits... It works when you change the regular expression to be more specific: you don't really want to match zero occurrences of a digit, but only one or more: grep -o "[1234567890]\+" grepbug-onlymatching.txt or grep -Eo [1234567890]+ grepbug-onlymatching.txt (Why the quotes are needed in the first alternative is beyond me.) Benno
