Find the smallest block

Shell Programming and Scripting
1

Hi,

Here's my data -

aa
bb
cc
aa
dd
ee

Now I need to find the smallest block surrounded by aa & dd. Following is not helpful -

sed -n '/aa/,/dd/p' file

I need only -
aa
dd

2

Using awk:

awk '
  /aa/{block=x;CAP=1}
  CAP{block=block "\n" $0}
  /dd/{print substr(block,2); CAP=block=x}' infile