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  1. Prepare
  2. Linux Shell
  3. Grep Sed Awk
  4. 'Grep' - B
  5. Discussions

'Grep' - B

  • fredericreinhar1
     + 1 comment
    grep "\([0-9]\) \?\1"

    On my system (Ubuntu 20.04 with GNU grep 3.4 the following simpler command works as well: grep -E "([0-9]) ?\1" I don't understand why it doesn't work here.