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yes good question i have used

grep -c "^[%]" vtipy.txt
and the number was 2126

vtip=$RANDOM
let "vtip=1+(vtip%2125)" #thats why here is 2125 it is modulo
awk -v cislo=$vtip...

Very nice ironmask2004 it is great too ....

I have just finished it with the previous solution
vtip=$RANDOM
let "vtip=1+(vtip%2125)"
awk -v cislo=$vtip '/%/{p++;next}p==cislo' vtipy.txt

Thank you very much Scrutinizer.... this helped me a lot...

awk '/%/{p++;next}p==1{print}' infile

Hallo
I have maybe a little bit advanced request....
I need to choose one random part betwen %....

so i have this..

%
text1 text1 text1
text1 text1 text1
text1 text1 text1
%
text2...