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How to group lines into batches

 
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# 1  
Old 12-30-2007
How to group lines into batches
Hi all

I need to group all the lines that start with 2. For every 3 lines (that start with 2) i need to group them in one group and add 1 for each group.

I need your help to batch the files content.The file look like this:

040171011140820070000000009650244002933170003000000075272
2H912279980109 01082007000688djjdfieuireurireiro
2H912279980109 01082007000688djjdfieuireurireiko
2F921338300506 01082007000688jkjddiwe02499834fg
2F921338300506 01082007000688
2H912279980109 0108200700019965787889890090uyk
2F921338300506 010820070000198676767675645shdjd
2F921338300506 010820070000178676767675645shdje

The output should look like this:
040171011140820070000000009650244002933170003000000075272
1
2H912279980109 01082007000688djjdfieuireurireiro
2H912279980109 01082007000688djjdfieuireurireiko
2F921338300506 01082007000688jkjddiwe02499834fg
1
2F921338300506 01082007000688
2H912279980109 0108200700019965787889890090uyk
2F921338300506 010820070000198676767675645shdjd
1
2F921338300506 010820070000178676767675645shdje

Pls help....tq in advance
# 2  
Old 12-30-2007
Code:
awk '/^2/ && c%3==0 {print "1"} /^2/{c++}1' file

# 3  
Old 01-01-2008
Thanks reborg,...i works perfecly,...i really appreaciate it
 
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