Function to generate WordPress auth salt that's safe to pass through Jinja template

saltmine.sh

function makeSalt() {
  # Create variable length passwords
  LC_CTYPE=C;
  local saltine=$(tr -dc 'A-Za-z0-9_@#$%^&*~!?;`./|:{} <>[]()-+='  < /dev/urandom | head -c 64)
  if [[ $(echo ${saltine} | grep -P '({%|%}|{#|#}|{{|}}|##)') ]]; then
    makeSalt;
  else
    echo "${saltine}";
  fi
}

# you can throw the funtion or source the file
# just store the output to a variable

# AUTH_KEY="$(makeSalt)"
# SECURE_AUTH_KEY="$(makeSalt)"
# ...