gistfile1.txt

TMPFILE=`mktemp /tmp/wave.XXXXXX` || exit 1
USERNAME=my_github_user_name
PASSWORD=my_password
curl -s --location -u $USERNAME:$PASSWORD https://github.com/waveaccounting/documentation/raw/master/devops/ssh_config | sed "s/USERNAME/$USERNAME/;/Identity/d" > $TMPFILE

lead='BEGIN WAVE SERVERS'
tail='END WAVE SERVERS'

sed -i.bak -e "/$lead/,/$tail/{
  /$lead/ {
    p
    r $TMPFILE
  }
  /$tail/p
  d
}" ~/.ssh/config

rm $TMPFILE