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Very interesting. I'm still floundering for a use case... can you give an outline if it's difficult to make a specific example? If you are not using search, bu
by jakeogh 9y ago
Very interesting. I'm still floundering for a use case... can you give an outline if it's difficult to make a specific example?
If you are not using search, but are using a recursive (-r) grep, then you are feeding a bunch of data to your pipe but don't care what file it came from. I get that... I mirrored the SEC's ftp back when it was ftp... and it's interesting for correlation and name stuff... but that's not going to work because it's freeform, and it's millions of small files... so you are using (large) files with a known format? Something like spectral datasets where the fields are passed with the data prefixed with it's important tags? Maybe logs?
- thriftwy 9y agoAs 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.
- jakeogh 9y agoAhhh. TIL!
- djKianoosh 9y agocool stuff, i was messing around with this. To then take that list of exceptions and find them back the actual files again, tack on at the end: `| grep -Fwf - *`