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identifying null values in a file

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# 1  
Old 02-12-2008
identifying null values in a file
I have a huge file with 20 fileds in each record and each field is seperated by "|". If i want to get all the reocrds that have 18th or for that matter any filed as null how can i do it? Please let me know
# 2  
Old 02-12-2008
To identify the null values on any field
Quote:
grep "||" filename
# 3  
Old 02-12-2008
But i want to see if particular field is null or not and not regular nulls in the file
# 4  
Old 02-12-2008
Code:
# lets do it for field #18
fld=18
awk -v fld=$fld ' -F'|'  \
   ' { if ($fld=="") { print "Line " $NR " has field " $fld " NULL" }}' myfile

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