Replace delimited block of text in file with the contents of another file

Replace.md

Replace Text Block

We have megaease.conf, and want to replace the contents in user.conf between the ######### MEGAEASE-BEGIN ########## and ######### MEGAEASE-END ########## lines.

First time, insert the block

echo "######### MEGAEASE-BEGIN ##########" >> user.conf
cat megaease.conf >> user.conf
echo "#########  MEGAEASE-END  ##########" >> user.conf

Then, update the block with new configuration

awk 'FNR==NR{ _[++d]=$0;next}                                                                                                                                                                                          
/######### MEGAEASE-BEGIN ##########/{
  print
  for(i=1;i<=d;i++){ print _[i] }
  f=1;next
}
/#########  MEGAEASE-END  ##########/{f=0}!f' megaease.conf  userr.conf > user.new.conf