Rename a header column by adding another column entry to the header column name URGENT!!


 
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# 1  
Old 08-05-2011
Rename a header column by adding another column entry to the header column name URGENT!!

Hi All,

I have a file example.csv which looks like this
Code:
GrpID,TargetID,Signal,Avg_Num
CSCH74_1_1,2007,61,256
CSCH74_1_1,212007,647,679
CSCH74_1_1,12007,3,32
CSCH74_1_1,207,299,777

I want the output as
Code:
GrpID,TragetID,Signal-CSCH74_1_1,Avg_Num
CSCH74_1_1,2007,61,256
CSCH74_1_1,212007,647,679
CSCH74_1_1,12007,3,32
CSCH74_1_1,207,299,777

That is to say, the Signal header becomes Signal-CSCH74_1_1 using the 1st column entry.

Please help me urgently!!

Thanks

Last edited by Franklin52; 08-06-2011 at 04:48 PM.. Reason: Please use code tags for data and code samples, thank you
# 2  
Old 08-05-2011
Try:
Code:
awk -F, -vOFS="," 'NR==1{x=$0;next}NR==2{t=$0;c=$1;$0=x;$3=$3"-"c;$0=$0"\n"t}1' file

# 3  
Old 08-05-2011
Hi thanks a ton!..

could you explain me from the part NR==2? Pardon my knowledge.

Also, i have to do this with another 240 files where every file has a separate unique GrpID. Could you help me as to how can I use this for many such files?

Thank you again!
# 4  
Old 08-05-2011
Assuming your 240 files are in the current directory:
Code:
for i in *; do awk -F, -vOFS="," 'NR==1{x=$0;next}NR==2{t=$0;c=$1;$0=x;$3=$3"-"c;$0=$0"\n"t}1' $i > $i.tmp; mv $i.tmp $i; done

# 5  
Old 08-05-2011
Thank you thank you thank you.. you are so helpful!!.. I really appreciate your help!

Smilie
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