Uniq or sort -u or similar only between { }


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# 8  
Code:
awk '
/\}/ {block=0; delete S}
(block==1) {
  if ($0 in S) {next} else {S[$0]}
}
{print}
/\{/ {block=1}
' input

The array S stores all encountered strings (where string is $0 i.e. the current line). At the end of the block it is deleted, so each block is separate.
The following stores the previous value in a simple variable S, and will only suppress adjacent duplicate lines.
Code:
awk '
/\}/ {block=0; found=0}
(block==1) {
  if (found==1 && $0==S) {next} else {S=$0; found=1}
}
{print}
/\{/ {block=1}
' input

The following input file demonstrates the difference:
Code:
{
   aaa
   bbb
   aaa
}

aaa
bbb
aaa

{
   aaa
   aaa
   ccc
}

NB awk uses ERE, and { and } have a special meaning. So it should be \{ and \}.
Then in principal my 1st sample is identical with Rudi's 2nd sample.

Last edited by MadeInGermany; 11-07-2014 at 09:43 AM..
# 9  
Code:
 $ cat file
{
   aaa
   bbb
   aaa
   ccc
}
ads
dvsah
{
   aaa
   aaa
}


$  awk '/\{/ {f=NR} f && !A[f,$0]++ {print} !f{print} /\}/{f=0}' file
{
   aaa
   bbb
   ccc
}
ads
dvsah
{
   aaa
}

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