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concatenate consecutive field values

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# 1  
Old 07-13-2010
Question concatenate consecutive field values
Hi,

I have a file like this

Code:
A  Bob
A  Sam
A  John
B  David
C  Paul
C  Sandra

If the consecutive field values in column one is same, then concatenate the corresponding strings.

So, I need an output like this,

Code:
A Bob_Sam_John
B David
C Paul_Sandra

I usually work with excel but couldn't make it. Any ideas how I can achieve this with AWK?

thanks in advance.
Last edited by radoulov; 07-13-2010 at 05:08 PM.. Reason: Code tags, please!
# 2  
Old 07-13-2010
Try:
Code:
awk 'p!=$1{if(NR>1)print s;s=$0;p=$1;next}{s=s"_"$2}END{print s}' infile

# 3  
Old 07-13-2010
Quote:
Originally Posted by Scrutinizer
Try:
Code:
awk 'p!=$1{if(NR>1)print s;s=$0;p=$1;next}{s=s"_"$2}END{print s}' infile

thanks a lot - its working perfectly.SmilieSmilie
# 4  
Old 07-13-2010
Code:
awk '{a[$1]=a[$1]"_"$2}END{for (i in a) {sub(/^_/,"",a[i]);print i,a[i]}}' urfile

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