NCO:使用包含空格的新字符串更改变量的属性值

Question

我有一个netCDF文件FORCING.nc，其中包含一个带有属性值units: hours since 2007-12-28 22:00:00的变量time。在python代码中，如下所示：

from netCDF4 import Dataset
Dataset('FORCING.nc')["time"]

产出如下：

Out[3]: 
<class 'netCDF4._netCDF4.Variable'>
float32 time(time)
    units: hours since 2007-12-28 22:00:00
unlimited dimensions: 
current shape = (13,)
filling on, default _FillValue of 9.969209968386869e+36 used

我想将units的属性从hours since 2007-12-28 22:00:00更改为hours since 1996-01-01 22:00:00。1996-01-01 22:00:00来自bash脚本中的变量$start_date。

所以我想用这样的方法：

ncatted -a units,time,o,c,'hours since '$start_date FORCING.nc

它将参数'hours since '+$start_date提供给随后捕获的命令，实际上它是'hours since 1996-01-01 22:00:00'。但我收到的错误信息如下：

ncatted: ERROR file start_date not found. It does not exist on the local filesystem, nor does it match remote filename patterns (e.g., http://foo or foo.bar.edu:file).
ncatted: HINT file-not-found errors usually arise from filename typos, incorrect paths, missing files, or capricious gods. Please verify spelling and location of requested file. If the file resides on a High Performance Storage System (HPSS) accessible via the 'hsi' command, then add the --hpss option and re-try command.

我想是因为“2007-12-28小时”和"22:00:00“之间有空隙。如果我使用ncatted -a units,time,o,c,'hours since 2007-12-28 22:00:00' FORCING.nc，它可以正常工作。但是我如何使用$start_date呢？因为每次运行代码时start_date都是不同的.

谢谢!

Answer 1

你快到了！试一试

ncatted -a units,time,o,c,'hours since '"$start_date" FORCING.nc

空壳引用规则。不能和他们生活在一起，没有他们就活不下去。