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For your original scenario, this might do:awk '/{/ {delete T}
T[$0]++ {next}
1
' file
For RavinderSingh's extended sc., try awk '/{/ ...

Hello,

Glad that given code is helpful for you, following are some links which can be helpful to you for awk learning.

http://www.staff.science.uu.nl/~oostr102/docs/nawk/nawkA4.pdf...

Hello Fugitivus,

Following may help you in same, let's say we have following input file.
Input file:

cat tst4567
{
aaa
bbb
aaa
ccc
}
{
aaa
aaa
}


Then we can...