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Shell Programming and Scripting

Replace 4th field if null

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# 1  
Old 08-03-2009
Replace 4th field if null
Hi ..
Can some one please suggest me how to replace 4th field(column) of a .csv file with "NA" if it is null.
Input file data:
Code:
|A|21|B1||1.1|
|A|21|C|RAGH|1.1|
|A|21|D1||1.1|
|A|21|C|YES|1.1

Expected Output
Code:
|A|21|B1|NA|1.1|
|A|22|C|RAGH|1.1|
|B|23|D1|NA|1.1|
|A|24|C|YES|1.1|

Thank you...

Next time use CODE-tags when posting code, data or logs to enhance readability and to preserve formatting like indention etc., ty.
Also your post got stuck in the moderation queue since it contains URLs. Just remind of it posting URLs next time - maybe change them a bit so post doesn't get lost.
Last edited by pasupuleti81; 08-03-2009 at 10:34 AM..
# 2  
Old 08-03-2009
Code:
awk 'BEGIN { FS="|"; OFS="|" } { if ($5=="") $5="NA"; print }' infile > outfile

# 3  
Old 08-03-2009
Also read my note in your post up there please.

Code:
awk -F"|" '$5 == "" {$5="NA"; print; next} {print}' OFS="|" infile
|A|21|B1|NA|1.1|
|A|21|B1|www.none.com|1.1|
|A|21|B1|NA|1.1|
|A|21|B1|www.trail.com|1.1|

# 4  
Old 08-03-2009
Thanks a lot fpmurphy !!! it worked.
# 5  
Old 08-03-2009
Code:
perl -ne '{s/(?<=\|)(?=\|)/NA/g;print;}'

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