[Solved] Problem in reading a file line by line till it reaches a white line

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# 1  
Old 08-19-2010
Tools [Solved] Problem in reading a file line by line till it reaches a white line

So, I want to read line-by-line a text file with unknown number of files....
while [ $b -eq 1]; do
b=`sed -n '$ap' test` 
a=`expr $a + 1`
$here do something with b etc

the problem is that sed does not seem to recognise the $a, even when trying
sed -n ' $a p'
So, I cannot read line by line this text file...How can I achieve this?
# 2  
Old 08-19-2010
with unknown number of files....
or number of lines?
# 3  
Old 08-19-2010
Reading a file line by line till it reaches a white line:
awk '/^.+$/{ print; next} {exit}' inputfile

# 4  
Old 08-19-2010
Thank you very much!
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