yaml_bash_parser.sh

#!/bin/sh

local prefix=$2
local s='[[:space:]]*' w='[a-zA-Z0-9_]*' fs=$(echo @|tr @ '\034')

sed -ne "s|^\($s\)\($w\)$s:$s\"\(.*\)\"$s\$|\1$fs\2$fs\3|p" \
     -e "s|^\($s\)\($w\)$s:$s\(.*\)$s\$|\1$fs\2$fs\3|p"  $1 |

awk -F$fs '{
   indent = length($1)/2;
   vname[indent] = $2;
   for (i in vname) {if (i > indent) {delete vname[i]}}
   if (length($3) > 0) {
      vn=""; for (i=0; i<indent; i++) {vn=(vn)(vname[i])("_")}
      printf("%s%s%s=\"%s\"\n", "'$prefix'",vn, $2, $3);
   }
}'

# Usage
# yaml_bash_parser.sh any_config.yml "config_"