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awk print columns which are not null

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Top Forums Shell Programming and Scripting awk print columns which are not null
# 1  
Old 09-19-2015
Error awk print columns which are not null
I am working on a file with several columns as below

Code:
MO_NAME,FAULT_TYPE,CLASS,CODE1,CODE2,CODE3
RXOCF-101,BTS INTERNAL,FAULT CODES CLASS 2A,53,58
RXOCF-101,BTS INTERNAL,FAULT CODES CLASS 2B,24
RXOCF-101,BTS INTERNAL,FAULT CODES CLASS 2A,33	
RXOCF-101,BTS INTERNAL,FAULT CODES CLASS 2D,57	
RXOCF-102,OPERATOR CONDITION	FAULT CODES CLASS 2B

By using awk I'm printing the output like this
Code:
awk -F',' '{print $1,$2,substr($1,1,5)"_"substr($3,19,20)$4,substr($1,1,5)"_"substr($3,19,20)$5' OFS="," file.txt

The output comes like this

Code:
RXOCF-101,BTS INTERNAL,RXOCF_2A53,RXOCF_2A58
RXOCF-101,BTS INTERNAL,RXOCF_2B24,RXOCF_2B
RXOCF-101,BTS INTERNAL,RXOCF_2A33,RXOCF_2A	
RXOCF-101,BTS INTERNAL,RXOCF_2D57,RXOCF_2D	
RXOCF-102,OPERATOR CONDITION,RXOCF_2B

I want to skip the columns whihc have null code or nothing in the code column. Please help to get this desired output
Moderator's Comments:
Mod Comment Please use CODE tags for sample input and output as well as for code segments.
Last edited by Don Cragun; 09-19-2015 at 06:53 PM.. Reason: Add more CODE tags.
# 2  
Old 09-19-2015
Not sure I understand. What columns are missing? How does 2A53 get into output line 2? And 2A into line 5?
# 3  
Old 09-19-2015
I am printing Col1,Col2,Partof(Col1)_Partof(Col2)Col4

if Col4 is null then the output is just like as above in my row 3,4 and 5 (last columns with no code)

2A53 comes from:

2A is part of Col3 and 53 is my Col4 (Concatenated both)
# 4  
Old 09-19-2015
Not in line 2.

---------- Post updated at 23:20 ---------- Previous update was at 23:19 ----------

And - what about $6?
# 5  
Old 09-19-2015
Don't have $6 in original file. Corrected it. Printing till $5 now
# 6  
Old 09-19-2015
What about the output in line 2?

---------- Post updated at 23:31 ---------- Previous update was at 23:30 ----------

A bit more care when specifying the problem would help us help you.
# 7  
Old 09-19-2015
In line 2, "2B" is the substring of column 3 and "24" comes from column 4.
It's the concatenation of substring of column 1, substring of column 3 and with code in column 4
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