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grep is a command-line tool for searching text patterns in files

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Without line breaks, grep is buffering all of the input, so that it can show you the "line" where the string appears. Two questions: Do you need the adjacent content? are there spaces or other … characters separating the tokens? If you don't need the context of the adjacent content and there are spaces separating tokens, just use tr to turn spaces into linefeeds: ./a.out | tr ' ' '\n' | grep
answered Jul 28 '15 by Tim B