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Shell Programming and Scripting

Pick and print

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# 1  
Old 07-01-2012
Pick and print
Hi Friends,

I'm facing an issue. I am having a file as under :
Code:
a1
b1
c1
a2
a3
a4
b4
a5
b5

and I need to get the output as under:
Code:
a1 b1
a4 b4
a5 b5

i.e. to pick the columns where a and b are consecutive and ignoring rest.

I was trying some thing sily as:
Code:
cat myfile | egrep -i "a|b"

Thanks in advance..
Last edited by Scrutinizer; 07-01-2012 at 07:02 AM.. Reason: code tags instead of quote tags
# 2  
Old 07-01-2012
Code:
sed -n '/^a/{$q;N;s/\(^a.*\)\n\(b.*\)/\1 \2/p}' inputfile

# 3  
Old 07-01-2012
Code:
awk '/^b/ && p~/^a/{print p,$0}{p=$0}' infile

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