As I have already said, grep -whor '[A-Z][A-Za-z]*Exception' * | sort | uniq -c for a histogram of exceptions inside logs downloaded from a bunch of nodes

As I have already said, grep -whor '[A-Z][A-Za-z]*Exception' * | sort | uniq -c for a histogram of exceptions inside logs downloaded from a bunch of nodes. As for -w, my favourite case is https://unix.stackexchange.com/questions/110645/select-lines-from-text-file-which-have-ids-listed-in-another-file https://unix.stackexchange.com/questions/110645/select-lines... As for -o, grep -o ........-....-....-....-............ It may look like Morse code, but what it does is greps UUIDs out.