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Issue while executing C executable with argument in shell script

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# 1  
Old 10-18-2013
Issue while executing C executable with argument in shell script
Hi All,
I am new to this forum and also shell script Smilie

My task is I have to read CSV file get the data from the file and use the data to call c executable with data as argument.And the output from c executable should be stored to new CSV file

Please find below my code

Code:
testfunction() { echo ${#1};./my_c_executable_file_name -l $1> op.txt; }
IFS=","
echo "Starting to read csv"
i=1
while read f1 f2
do
    echo "$f2";
    testfunction "$f2";
    value=$(<op.txt);
    echo $f1, $value >> output.csv

done < Book1.csv

Now the issue is the data coming from 1st CSV is around 804 characters, but when the code is executing the c executable it is not sending complete string in the argument.

I tried to remove \n but got an error file name too long.

Please help me for the same.

Thanks in advance
# 2  
Old 10-18-2013
Quote:
Originally Posted by ravjot28
Hi All,
I am new to this forum and also shell script Smilie

My task is I have to read CSV file get the data from the file and use the data to call c executable with data as argument.And the output from c executable should be stored to new CSV file

Please find below my code

Code:
testfunction() { echo ${#1};./my_c_executable_file_name -l $1> op.txt; }
IFS=","
echo "Starting to read csv"
i=1
while read f1 f2
do
    echo "$f2";
    testfunction "$f2";
    value=$(<op.txt);
    echo $f1, $value >> output.csv

done < Book1.csv

Now the issue is the data coming from 1st CSV is around 804 characters, but when the code is executing the c executable it is not sending complete string in the argument.

I tried to remove \n but got an error file name too long.

Please help me for the same.

Thanks in advance
Try making the following changes and running your script again:
Change:
Code:
testfunction() { echo ${#1};./my_c_executable_file_name -l $1> op.txt; }

to:
Code:
testfunction() { echo ${#1};./my_c_executable_file_name -l "$1" > op.txt }

and change:
Code:
    echo $f1, $value >> output.csv

to:
Code:
    printf "%s,%s\n" "$f1" "$value" >> output.csv

# 3  
Old 10-19-2013
Thank you for the reply

I tried with the modification as stated above but still I m getting the same error.

Still the executable is throwing error missing last part of string.

For your information
The data coming from CSV contains \n , \ and | among alpha numeric values.

I suspect these can be the issue for not sending the complete string to c executable.

Please let me know if there is any way I can resolve this.
# 4  
Old 10-19-2013
In addition to Don's suggestions, I would keep IFS local to the read command instead of using it globally. Also try using -r to stop read from interpreting \ characters.
Code:
while IFS=, read -r f1 f2 f3

The dummy third variable ($f3) would need to be added only in case the csv has more than 2 fields, otherwise fields 3 and higher wind up in $f2 as well.
Last edited by Scrutinizer; 10-19-2013 at 02:16 AM..
# 5  
Old 10-19-2013
Thanks for the reply Sir

Let me provide you the example that will clear things
Data in CSV is
Code:
\
aadsa=1|dasdsa=adsada-4096|wedewq=sdsadasasdsa|wqewqe=weww-sadasd\
|C2S=004120F1707E4928|DOI=1225906924|DOE=1226511724|ISS=1|NUM=28036|CM\
T=chassis52license|LSP=22000|LSH=22000|LSG=11000|LSL=11000|LSC=10000|L\
EC=1000|LGT=11000|LSA=22000|FIS=Y|FR4=Y|FPP=Y|FTC=Y|FMG=Y|FCR=Y|FSR=Y|\
FPM=Y|FID=Y|FI6=Y|FLI=Y|FPF=Y|FFA=Y|FCA=Y|FUT=Y|FSS=Y|FDB=Y|FDA=Y|FTM=\
Y|FDU=Y|FTP=Y|FTA=Y|FFP=Y|FSA=Y|LIM=19100|LCC=19100|LPC=100|LIS=100|FD\
R=Y|BME=Y|qwewqe=Y|BSC=Y|FRC=Y|FMN=Y|FBM=Y|FDC=Y|FGR=Y|FAA=Y|FRF=Y|FDQ=Y|\
FEL=Y|FIN=Y|qeqweqw=Y|BKO=Y|BEP=Y|FIP=Y|FRO=Y|LSI=11000|LSR=11000|LSS=1100\
0|LSN=11000|qwewqe=Y|LSW=21000|FCC=Y|FCP=Y|LCF=1000|LPP=1000|FVM=Y|FVG=Y|\
FPD=Y|FPR=Y|FVA=Y|FES=Y|FSN=Y|FCD=Y|LSF=1000|FVI=Y|FON=Y|FLS=Y|FSG=Y|F\
qweqe=Y|qwewq=Y|wwqe=Y|adsa=Y|FPC=Y|asdasd=Y|ads=asdad/adaddadas+AU\
aasdasd/qweqwe

and when I tried Don's suggestion I am getting the error

Code:
missing  string ON=Y|FLS=Y|FSG=Y|F\
qweqe=Y|qwewq=Y|wwqe=Y|adsa=Y|FPC=Y|asdasd=Y|ads=asdad/adaddadas+AU\
aasdasd/qweqwe i.e the last part of the string.

I need the complete data to be sent to the c executable

trying Scrutinizer 's code the data is getting split on the basis of \ which is not the requirement.
Last edited by Scrutinizer; 10-19-2013 at 02:56 AM.. Reason: code tags
# 6  
Old 10-19-2013
But that file is not comma-separated, like your code sample suggested. I don't think it would qualify as a CSV. What is the structure of the file and what are you trying to feed into that function?

--
My suggestion does not split on the the basis of \ by the way, it refrains from interpreting \, so it does not join the lines and and since you specified IFS="," , the literal lines in the file end up in field 1.
Last edited by Scrutinizer; 10-19-2013 at 03:11 AM..
# 7  
Old 10-19-2013
My aim is I am having the above format data, and I want to parse the data based on some logic that is present in c executable file.

Now the data count is around 2k so I thought to move the data to csv file and read it from the file and parse it and store to new csv file.

Is there any other solution for the same??

I am not aware of reading excel file so I chose for csv.

Please suggest me in case of any other solution.

Thanks
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