title: where选项

weight: 3

where选项 -w 用于打印符合约束条件的消息。 约束条件有如下的格式：

IS

  1. key=value

下面命令打印层次值等于100的要素场。

  1. $ grib_ls -w level=100 gmf.gra.2020011800003.grb2
  2. gmf.gra.2020011800003.grb2
  3. edition      centre       date         dataType     gridType     typeOfLevel  level        stepRange    shortName    packingType
  4. 2            babj         20200118     fc           regular_ll   isobaricInhPa  100          3            gh           grid_jpeg
  5. ...
  6. 2            babj         20200118     fc           regular_ll   isobaricInhPa  100          3            unknown      grid_jpeg
  7. 24 of 837 messages in gmf.gra.2020011800003.grb2
  9. 24 of 837 total messages in 1 files

IS NOT

  1. key!=value

下面命令打印层次类型不等于surface的要素场。

  1. $ grib_ls -w typeOfLevel!=surface gmf.gra.2020011800003.grb2
  2. gmf.gra.2020011800003.grb2
  3. edition      centre       date         dataType     gridType     typeOfLevel  level        stepRange    shortName    packingType
  4. 2            babj         20200118     fc           regular_ll   nominalTop   0            3            ulwrf        grid_jpeg
  5. 2            babj         20200118     fc           regular_ll   nominalTop   0            3            unknown      grid_jpeg
  6. 2            babj         20200118     fc           regular_ll   nominalTop   0            0-3          nswrf        grid_jpeg
  7. 2            babj         20200118     fc           regular_ll   nominalTop   0            3            uswrf        grid_jpeg
  8. 2            babj         20200118     fc           regular_ll   nominalTop   0            3            nswrfcs      grid_jpeg
  9. 2            babj         20200118     fc           regular_ll   nominalTop   0            3            uswrf_cs     grid_jpeg
  10. 2            babj         20200118     fc           regular_ll   heightAboveGround  2            3            q            grid_jpeg
  11. ...

AND

  1. key1=value1,key2=value2,key3=value3

下面代码打印层次值为100的温度场。

  1. $ grib_ls -w level=100,shortName=t gmf.gra.2020011800003.grb2
  2. gmf.gra.2020011800003.grb2
  3. edition      centre       date         dataType     gridType     typeOfLevel  level        stepRange    shortName    packingType
  4. 2            babj         20200118     fc           regular_ll   isobaricInhPa  100          3            t            grid_jpeg
  5. 1 of 837 messages in gmf.gra.2020011800003.grb2
  7. 1 of 837 total messages in 1 files

OR

  1. key=value1/value2/value3

下面代码打印层次值为100或200或300或500的温度场

  1. $ grib_ls -w level=100/200/300/500,shortName=t gmf.gra.2020011800003.grb2
  2. gmf.gra.2020011800003.grb2
  3. edition      centre       date         dataType     gridType     typeOfLevel  level        stepRange    shortName    packingType
  4. 2            babj         20200118     fc           regular_ll   isobaricInhPa  500          3            t            grid_jpeg
  5. 2            babj         20200118     fc           regular_ll   isobaricInhPa  300          3            t            grid_jpeg
  6. 2            babj         20200118     fc           regular_ll   isobaricInhPa  200          3            t            grid_jpeg
  7. 2            babj         20200118     fc           regular_ll   isobaricInhPa  100          3            t            grid_jpeg
  8. 4 of 837 messages in gmf.gra.2020011800003.grb2
  10. 4 of 837 total messages in 1 files

使用 -w 参数意味着只有满足所有约束条件的消息才会被处理。