Filling in the empty columns with rows above them


 
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# 1  
Old 01-22-2013
Filling in the empty columns with rows above them

Hi,

I have a text file where some of the values in columns are missing:

Input:

Code:
QhFudW3dKSYL2NTQUA 1 11133999-11134048
uhIp9KxB6USIy16CEY 1 11126760-11126774
11126775-11126805
11128065-11128068
6epeZ6CTNW4Au8uXys 1 24480823-24480872
Tp3nvutucBZ13CjuXc 1 155204870-155204891
155204986-155205013
BTvcUX6UfSQvT14qdU 1 155205079-155205102
155205472-155205497
KJHpTuHJ_V00o1DSgk 1 64416412-64416461

I want to write a code to fill in the missing columns with the rows above themso that the output looks like:

Code:
QhFudW3dKSYL2NTQUA 1 11133999-11134048
uhIp9KxB6USIy16CEY 1 11126760-11126774
uhIp9KxB6USIy16CEY 1 11126775-11126805
uhIp9KxB6USIy16CEY 1 11128065-11128068
6epeZ6CTNW4Au8uXys 1 24480823-24480872
Tp3nvutucBZ13CjuXc 1 155204870-155204891
1Tp3nvutucBZ13CjuXc 1 55204986-155205013
BTvcUX6UfSQvT14qdU 1 155205079-155205102
BTvcUX6UfSQvT14qdU 1 155205472-155205497
KJHpTuHJ_V00o1DSgk 1 64416412-64416461

How do I go about doing that? Thanks!
# 2  
Old 01-22-2013
Try:
Code:
awk '{if(NF==1)$0=p FS $0; else p=$1 FS $2}1'  file

This User Gave Thanks to Scrutinizer For This Post:
# 3  
Old 01-22-2013
@Scrutinizer: Please do explain Smilie
# 4  
Old 01-22-2013
Explanation:
Code:
awk '
  {
    if(NF==1)$0=p FS $0    # if there is only one field on a line then prepend the current line with p and a space
    else p=$1 FS $2        # else set p to field 1, a space and field 2
  }
  1                        # print the current record (line)
'  file

 
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