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Full Discussion: Find Null values in Columns and fail execution by displaying error message
Top Forums UNIX for Dummies Questions & Answers Find Null values in Columns and fail execution by displaying error message Post 302940488 by tpk on Monday 6th of April 2015 12:09:08 PM
Old 04-06-2015
Linux Find Null values in Columns and fail execution by displaying error message
Hi All,

I am new to shell scripting. I have a requirement as part of my job to find out null/empty values in column 2 and column 3 from a CSV file and exit the further execution of script by displaying a simple error message.

I have developed a script to do this by reading various articles from this forum but ended up with no luck, each time I run the script it is going to else part of the loop and printing "All records are Good" and Line no 17 -F,:not found syntax error.

PFB my script and sample file which I am using for testing,

Sample file: pf_20120406.csv
Code:
D,xsn,des,1.23,3.43,34.9203,234.23423,12.345,234.987,987.342,789.345,679.0987,345.657,345.987,987.098
D,xsn,des,1.23,3.43,34.9203,234.23423,12.345,234.987,987.342,789.345,679.0987,345.657,345.987,987.098
D,,,1.23,3.43,34.9203,234.23423,12.345,234.987,987.342,789.345,679.0987,345.657,345.987,987.098
D,xsn,des,1.23,3.43,34.9203,234.23423,12.345,234.987,987.342,789.345,679.0987,345.657,345.987,987.098
D,xsn,des,1.23,3.43,34.9203,234.23423,12.345,234.987,987.342,789.345,679.0987,345.657,345.987,987.098
D,,des,1.23,3.43,34.9203,234.23423,12.345,234.987,987.342,789.345,679.0987,345.657,345.987,987.098
D,xsn,des,1.23,3.43,34.9203,234.23423,12.345,234.987,987.342,789.345,679.0987,345.657,345.987,987.098
D,xsn,,1.23,3.43,34.9203,234.23423,12.345,234.987,987.342,789.345,679.0987,345.657,345.987,987.098

pf_validations.sh
Code:
#!/usr/bin/sh
#
#filename=`ls -ltr /var/datastage/FRPDEVL/work/source/landing/dspf/pf_*.csv`
#
for fname in /var/datastage/FRPDEVL/work/source/landing/dspf/pf_*.csv;do
filename=`basename $fname`
fdate=`echo $filename|tr -dc '[:digit:]'`

  #Validation 1: Column B and C should not have a null value they are of varchar type.
  if [ $filename = 'pf_'$fdate'.csv' ]
  then
  echo "------------------------------------------------------------------------------------"
  echo "Checking Specific Validations for File: pf_$fdate.csv"
  echo "------------------------------------------------------------------------------------"
  sed '1d;$d' pf_$fdate.csv >pf_$fdate.tmp
  #grep -lE '(,,|,$)' *.csv
  value=`awk -F"," '{if ( $2 ~ /^ *$/ ) printf("102") if ( $3 ~ /^ *$/ ) printf("104") printf("\n")}' pf_$fdate.tmp`
  #while read line;do
  if [[ "$value" == "102" || "$value" == "104" ]]
  then
  echo "Null value present in file"
  echo "Hence exiting the Job"
  rm -f pf_$fdate.tmp
  exit 16  
  else
  echo "All records are good"  
  fi
  #done <pf_$fdate.tmp
  echo "------------------------------------------------------------------------------------"
  echo "Specific Validations check for File: pf_$fdate.csv completed"
  echo "------------------------------------------------------------------------------------"  
  fi
  
  rm -f pf_$fdate.tmp
 
done

Please help me how can I achieve my requirement and help me with the correct code snippet.

It would be of great help. Thanking you all in advance

With Regards,
TPK.
 

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LEARN ABOUT DEBIAN

algorithm::checkdigits::m10_003

CheckDigits::M10_003(3pm)				User Contributed Perl Documentation				 CheckDigits::M10_003(3pm)

NAME

       CheckDigits::M10_003 - compute check digits for ISMN

SYNOPSIS

	 use Algorithm::CheckDigits;

	 $ismn = CheckDigits('ismn');

	 if ($ismn->is_valid('M-345-24680-5')) {
	       # do something
	 }

	 $cn = $ismn->complete('M-345-24680');
	 # $cn = 'M-345-24680-5'

	 $cd = $ismn->checkdigit('M-345-24680-5');
	 # $cd = '5'

	 $bn = $ismn->basenumber('M-345-24680-5');
	 # $bn = 'M-345-24680'

DESCRIPTION

   ALGORITHM
       1.  The 'M' as the first number gets the value 3.  Beginning left all numbers are weighted alternatively 3 and 1.

       2.  The sum of all products is computed.

       3.  The sum of step 3 ist taken modulo 10.

       4.  The check digit is the difference between 10 and the number from step 3 taken modulo 10.

   METHODS
       is_valid($number)
	   Returns true only if $number consists solely of numbers and the last digit is a valid check digit according to the algorithm given
	   above.

	   Returns false otherwise,

       complete($number)
	   The check digit for $number is computed and concatenated to the end of $number.

	   Returns the complete number with check digit or '' if $number does not consist solely of digits and spaces.

       basenumber($number)
	   Returns the basenumber of $number if $number has a valid check digit.

	   Return '' otherwise.

       checkdigit($number)
	   Returns the checkdigit of $number if $number has a valid check digit.

	   Return '' otherwise.

   EXPORT
       None by default.

AUTHOR

       Mathias Weidner, <mathias@weidner.in-bad-schmiedeberg.de>

SEE ALSO

       perl, CheckDigits, www.pruefziffernberechnung.de.

perl v5.10.0							    2008-05-17						 CheckDigits::M10_003(3pm)
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