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thanks R.Singh. The code works as expected.

:b::b::b:

Thanks R.Singh. it works as expected.
one more question, I want to count total number of lines and put total number at end of the record. I don't know how to hold all the lines and print at end of...

thanks R.Singh.
I tried to use awk to archive this, but it doesn't work as I have very limited knowledge.
below is my code. my thought is: first read section into ARRAY, then read next line; then...

Hi Gurus,
I have below file which has different sections, need to move the sections to beginning of the each record.
original file
[abc_xxxx_yyyy]
aaa
bbb
ccc
[abc_mmmm_nnnn]
ddd
eee
fff
...