linux - Grep 搜索多行字符串模式 linux

Question

我在文件 test.txt 中有以下文本: (注意:可以有更多'Boundary : CRAC' block )

BOUNDARY: CRAC2OUT
  Boundary Type = INLET
  Location = CRAC_OUT2
  BOUNDARY CONDITIONS:
    FLOW REGIME:
      Option = Subsonic
    END
    HEAT TRANSFER:
      Option = Static Temperature
      Static Temperature = 16 [C]
    END
    MASS AND MOMENTUM:
      Normal Speed = (3.8/1.185)[m^3 s^-1]/area()@CRAC2OUT
      Option = Normal Speed
    END
    TURBULENCE:
      Option = Medium Intensity and Eddy Viscosity Ratio
    END
  END
END
BOUNDARY: CRAC3OUT
  Boundary Type = INLET
  Location = CRAC_OUT3
  BOUNDARY CONDITIONS:
    FLOW REGIME:
      Option = Subsonic
    END
    HEAT TRANSFER:
      Option = Static Temperature
      Static Temperature = 16 [C]
    END
    MASS AND MOMENTUM:
      Normal Speed = (3.8/1.185)[m^3 s^-1]/area()@CRAC3OUT
      Option = Normal Speed
    END
    TURBULENCE:
      Option = Medium Intensity and Eddy Viscosity Ratio
    END
  END
END
BOUNDARY: CRAC4OUT
  Boundary Type = WALL
  Location = CRAC_OUT4
  BOUNDARY CONDITIONS:
    HEAT TRANSFER:
      Option = Adiabatic
    END
    MASS AND MOMENTUM:
      Option = No Slip Wall
    END
    WALL ROUGHNESS:
      Option = Smooth Wall
    END
  END
END

我需要搜索 CRAC3OUT 并将其 block 中的静态温度值替换为 17 而不是 16，同样将其正常速度更改为 4.8 而不是 3.8。 我只需要为 CRAC3OUT 更改那个 block 。

我如何使用 grep 或 pcregrep 来执行此操作？

Answer 1

perl -i -lne 'if(/^\s*Static Temperature/ && $f==1){s/16/17/g;};
              if(/^\s*Normal Speed =/ && $f==1){s/4\.8/3.8/g;$f=0};
              $f=1 if(/BOUNDARY: CRAC3OUT/);
              print $_' your_file