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awk number rows from 1 to 3 in file

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# 1  
Old 12-01-2010
Tools awk number rows from 1 to 3 in file
I have a file with the following format, i need to change de field9 each 3 rows to renumber field9 with gpo1, gpo2, gpo3.
I need to use awk

Original file
Code:
field1    field2    field3    field4    field5    field6    field7    field8     gpo3
field1    field2    field3    field4    field5    field6    field7     field8     gpo76
field1    field2    field3    field4    field5    field6    field7     field8     gpo4
field1    field2    field3    field4    field5    field6    field7     field8     gpo5
field1    field2    field3    field4    field5    field6    field7     field8     gpo88
field1    field2    field3    field4    field5    field6    field7     field8     gpo99

New file
Code:
field1    field2    field3    field4    field5    field6    field7     field8     gpo1
field1    field2    field3    field4    field5    field6    field7     field8     gpo2
field1    field2    field3    field4    field5    field6    field7     field8     gpo3
field1    field2    field3    field4    field5    field6    field7     field8     gpo1
field1    field2    field3    field4    field5    field6    field7     field8     gpo2
field1    field2    field3    field4    field5    field6    field7     field8     gpo3

thanks in advance
# 2  
Old 12-01-2010
Code:
awk 'NR<=3?s="gpo"NR:s="gpo"NR-3{$NF=s}1' OFS=\\t file

Last edited by cabrao; 12-01-2010 at 11:19 AM..
# 3  
Old 12-01-2010
Code:
awk '$NF="gpo"i++%3+1' OFS="\t" infile

This User Gave Thanks to Scrutinizer For This Post:
cabrao
# 4  
Old 12-01-2010
thanks Scrutnizer works perfectly
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