Bash script

 
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# 8  
Old 05-11-2018
Try:
Code:
awk '(NR+6)%11' file > newfile

GNU sed:
Code:
sed '16~11d' file > newfile

Bash/ksh93/zsh:
Code:
while IFS= read -r line
do
  (( (++nr+6)%11 )) || continue
  printf "%s\n" "$line"
done < file > newfile

# 9  
Old 05-31-2018
I agree with Scrutinzer, it's the way to go.
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