how to print out consecutive two line from a text file


 
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# 1  
Old 07-19-2011
how to print out consecutive two line from a text file

the text file like below's
input:

aaaaaaaaafdsfsda
sdfsadfasdfasfds

sdfadsf
asdfadf
asdfa

adfsfsafas

sdfsfafads
asdfasdfsa

I want to print out consecutive two line

output:

aaaaaaaaafdsfsda
sdfsadfasdfasfds

sdfsfafads
asdfasdfsa
# 2  
Old 07-20-2011
Try...
Code:
awk '{a[NR]=$0}END{for(i=1;i<NR;i++)if(a[i]&&a[i+1]&&!a[i-1]&&!a[i+2])print a[i] ORS a[i+1] ORS}' file1

 
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