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Help command grep

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linux-howto

http://www.unix.com – I have a file energy.tr . With the following contents: (part of which is shown below) ------------------------------------------------------- D 0.001728031 _0_ MAC APS 0 CM7 8 [0 ffffffff 2 0] [energy 0.999674 ei 0.000 es 0.000 et 0.000 er 0.000] r 0.001728033 _4_ MAC --- 0 CM7 8 [0 ffffffff 2 0] [energy 0.999866 ei 0.000 es 0.000 et 0.000 er 0.000] r 0.001728034 _5_ MAC --- 0 CM7 8 [0 ffffffff 2 0] [energy 0.999866 ei 0.000 es 0.000 et 0.000 er 0.000] D 0.001728043 _1_ MAC APS 0 CM7 8 [0 ffffffff 2 0] [energy 0.999674 ei 0.000 es 0.000 et 0.000 er 0.000] s 0.002368000 _1_ MAC (HowTos)