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Count null values in a file using awk

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# 1  
Old 04-14-2017
Count null values in a file using awk
I have the following a.txt file

Code:
A|1|2|3|4|5|
A||2|3|0||
A|1|6||8|10|
A|9|2|3|4|1|
A|0|9|3|4|5|
A||2|3|4|5|
A|0|av|.9|4|9

|

I use the following command to count null values for 2nd field

Code:
awk -F"|" '!$2 { N++; next } END {print N}' a.txt

It should give the result 2, but it is giving me 4.
I don't know why it is counting '0' as a null value.

Other than 0, the query is returning perfect value.
Please help me out.


Moderator's Comments:
Mod Comment Please use CODE tags as required by forum rules!
Last edited by RudiC; 04-15-2017 at 03:26 AM.. Reason: Changed CODE tags to ICODE.
# 2  
Old 04-14-2017
Hello RJG,

Could you please try following and let me know if this helps you.
Code:
awk -F"|" '$2==""{N++} END{print N}'   Input_file

In your code it will consider NULL $2 values as well as 0 values too.

Thanks,
R. Singh
This User Gave Thanks to RavinderSingh13 For This Post:
RJG
# 3  
Old 04-14-2017
Rajinder,

It works magically.Thanks
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