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how to find null column

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# 1  
Old 11-22-2010
how to find null column
Hi, everyone
I have a requirement as following:
source file
1, abc, def, caaa
2, , cde, aaa
3, bcd, , adefefg
I need find columns which contains null value, in above example,
I need get two rows
2, , cde, aaa
3, bcd, , adefefg
anybody has idea how to achive this

thanks in advance
ken002
# 2  
Old 11-22-2010
Code:
 awk -F, ' {for(i=1;i<=NF;++i) { s=$i; gsub(/ +/, "", s); if(s=="") { print; break; }} } ' infile OFS=,

This User Gave Thanks to kevintse For This Post:
# 3  
Old 11-22-2010
Code:
grep ", ," infile

This User Gave Thanks to rdcwayx For This Post:
# 4  
Old 11-22-2010
Hi ken002,

I am sure that experts will help you with a nice command, however with my very basic knowledge I would do this:

Code:
grep ", ," input file > output file

This User Gave Thanks to GoldenFire For This Post:
# 5  
Old 11-22-2010
Quote:
Originally Posted by rdcwayx
Code:
grep ", ," infile

Good idea, but this will be better.
Code:
grep ", *," infile

This User Gave Thanks to kevintse For This Post:
# 6  
Old 11-22-2010
Thanks everybody for your quick response
ken002
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