Re: puzzled with using getenv for getting shell environment variable

David (and Andrew)

With your corrections, the script and concept works.
getenv works.
My errors were based in shell scripting, not ncl.
Thank you for your time here.
 -Erik
Corrected bash code is below, in case others were following along.

#!/usr/bin/env bash
# loop through set of files with an ncl script

export WORKDIR=$HOME/myWorkDir/POST_PROCESSING/20km_CAM_6_hour/winds/ncep2_grid
export SCRIPTDIR=.$HOME/myWorkDir/myScripts/ncl/
# List Files
cd $WORKDIR
echo $PWD
export FILI='ls ncep2_grid_Experiment_*'
echo $FILI
# Loop through list of files
for fil in $FILI
        do
                if [ ! -e "$fil" ] # Check if file exists.
        then
               echo "$fil does not exist."; echo
        continue # On to next.
        fi
               echo "Working on $fil"
               export fil=$fil # Make into an Environment variable to
pass into ncl script

                # Execute script <- make sure that ncl script reads env. variable $fil
                ncl test.ncl
        done
echo "Finished."
exit 0

On Tue, Nov 1, 2011 at 2:33 PM, David Brown <dbrown@ucar.edu> wrote:
> Hi Eric,
> In your shell script you have made FILI into an environment variable, but fil is only a shell variable. That is why NCL cannot see it. In your 'for' loop you need to export $fil before calling ncl.
>  -dave
>
> On Nov 1, 2011, at 10:45 AM, Erik N wrote:
>
>> I'm having difficulty with passing a shell environment variable to the
>> ncl script with the getenv command.
>> The environment variable is "fil."
>> The shell script works fine.
>> But when I look at the ncl output using the print statement, the
>> string is missing. It is supposed to say "ncep2_grid_Experiment_.... "
>> Is this expected?
>>
>> -Erik
>>
>>
>> ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; shell script
>> [nobleeu@Erik-Nobles-iMac] ncep2_grid $ cat loop_ncl_script.sh
>>
>> #!/usr/bin/env bash
>> #  loop through set of files with a ncl script
>> export WORKDIR=$HOME/myWorkDir/POST_PROCESSING/20km_CAM_6_hour/winds/ncep2_grid
>> export SCRIPTDIR=.$HOME/myWorkDir/myScripts/ncl/
>>
>> #  List Files
>> cd $WORKDIR
>> echo $PWD
>> export FILI="ls ncep2_grid_Experiment_*"
>> echo $FILI
>> # Loop through list of files
>> for fil in $FILI
>>       do
>>               if [ ! -e "$fil" ]       # Check if file exists.
>>        then
>>        echo "$fil does not exist."; echo
>>        continue                # On to next.
>>        fi
>>        # echo "Extract Variable from $fil . "
>>               # Execute script <- make sure that ncl script reads env. variable $fil
>>               time ncl test.ncl
>>       done
>> echo "Finished."
>> exit 0
>>
>> ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;NCL CODE
>> ;;test.ncl
>>
>> file_in = getenv("fil")
>> print(file_in)
>>
>>
>> ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;TERMINAL OUTPUT when executing shell script
>>
>> [nobleeu@Erik-Nobles-iMac] ncep2_grid $ ./loop_ncl_script.sh
>> /Users/nobleeu/myWorkDir/POST_PROCESSING/20km_CAM_6_hour/winds/ncep2_grid
>> ls ncep2_grid_Experiment_01_UV.nc ncep2_grid_Experiment_02_UV.nc
>> ncep2_grid_Experiment_03_UV.nc ncep2_grid_Experiment_04_UV.nc
>> ncep2_grid_Experiment_05_UV.nc ncep2_grid_Experiment_06_UV.nc
>> ncep2_grid_Experiment_07_UV.nc ncep2_grid_Experiment_08_UV.nc
>> ncep2_grid_Experiment_09_UV.nc ncep2_grid_Experiment_10_UV.nc
>> ncep2_grid_Experiment_11_UV.nc ncep2_grid_Experiment_12_UV.nc
>> ncep2_grid_Experiment_13_UV.nc ncep2_grid_Experiment_14_UV.nc
>> ncep2_grid_Experiment_15_UV.nc ncep2_grid_Experiment_16_UV.nc
>> ncep2_grid_Experiment_17_UV.nc ncep2_grid_Experiment_18_UV.nc
>> ncep2_grid_Experiment_19_UV.nc ncep2_grid_Experiment_20_UV.nc
>> ncep2_grid_Experiment_21_UV.nc ncep2_grid_Experiment_22_UV.nc
>> ncep2_grid_Experiment_23_UV.nc ncep2_grid_Experiment_24_UV.nc
>> ncep2_grid_Experiment_25_UV.nc ncep2_grid_Experiment_26_UV.nc
>> ncep2_grid_Experiment_27_UV.nc ncep2_grid_Experiment_28_UV.nc
>> ncep2_grid_Experiment_29_UV.nc ncep2_grid_Experiment_30_UV.nc
>> ncep2_grid_Experiment_31_UV.nc ncep2_grid_Experiment_32_UV.nc
>> ls does not exist.
>>
>> Working on ncep2_grid_Experiment_01_UV.nc
>> Copyright (C) 1995-2011 - All Rights Reserved
>> University Corporation for Atmospheric Research
>> NCAR Command Language Version 6.0.0
>> The use of this software is governed by a License Agreement.
>> See http://www.ncl.ucar.edu/ for more details.
>>
>>
>> Variable: file_in
>> Type: string
>> Total Size: 8 bytes
>>            1 values
>> Number of Dimensions: 1
>> Dimensions and sizes: [1]
>> Coordinates:
>> Number Of Attributes: 1
>>  _FillValue : missing
>> (0)   missing
>>
>> real  0m0.173s
>> user  0m0.011s
>> sys   0m0.008s
>>
>> <snip>
>> _______________________________________________
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>
>
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Received on Tue Nov 1 13:24:33 2011