6 ms·

Here to plug using `--passthru`/`--passthrough`: it will print all lines, but highlight matches. I often do things like this to watch an output log, but highlig

• CJefferson 9y ago
  I wondered what that option could be useful for, thanks!
• okdana 9y ago
  You can achieve that in almost any of these tools (including old-school grep) by matching against something with zero width, like this: grep '^|.*PLUGH.*'
  • petepete 9y ago
    You could do that. Or you could just use --passthrough. It's easy to remember, easy to type, it autocompletes, it doesn't interfere with your criteria.
• whacker 9y ago
  The equivalent in grep is '--line-buffered'.
  • richardwhiuk 9y ago
    huh?
    • whacker 9y ago
      I mean you can use grep as a filter for tail -f output.
  • palotasb 9y ago
    That's an orthogonal feature, it writes output after each line as opposed to every 4096 bytes, when the output is a pipe instead of a terminal. Useful when the other end of the pipe still goes to the terminal and you want to see it immediately. If `some-util-with-output` echoes stdin then without the option the following would not show you the latest grepped lines until the 4096 buffer fills. tail -F output.log | grep --line-buffered TEXT | some-util-with-output