Script to reorder strings based on a file pattern

reorder-dtd.sh

#!/bin/bash

# This script allow reorder of strings from a foreign .dtd file
# based on the en-US file and keeping original comments

#en-US base folder
dtd_base_folder='/home/antoine/Dev/nightingale-l10n/locales/en-US/songbird/'

for lang_code in $(cat /home/antoine/Dev/songbird-l10n/shipped-locales)
do

  for dtd_file in $dtd_base_folder*.dtd; do
    dtd_file=`basename $dtd_file`


    dtd_cur_file='/home/antoine/Dev/songbird-l10n/locales/'$lang_code'/songbird/'

    # Read all lines of dtd
    while read line
    do
    mavar=`echo -e "$line"`
    # cut the string to the " caracter
    mavar2=`echo "$mavar" | sed 's!^\([^"]*\)".*$!\1!'`
    checkcomm=`echo "$mavar2" | cut -c 1-4`
    # Check if we have a comment
    if [ "$checkcomm" == '<!--' ]
    then
    mavar3="$mavar2"
    #echo "comment "$mavar3
    echo $mavar3 >> $dtd_cur_file$dtd_file.new
    else
    # remove spaces before and after string
    mavar4=`echo "$mavar2" | sed 's/^\ *//;s/\ *$//'`
    fi
    # Check if we have an empty line
    if [ "$checkcomm" == "" ]
    then
    #echo "empty line"
    echo "" >> $dtd_cur_file$dtd_file.new
    else
    if [ "$mavar4" == "" ]
    then
    echo ""
    else
    cat $dtd_cur_file$dtd_file | grep ^"$mavar4"" " >> $dtd_cur_file$dtd_file.new
    fi
    fi
    done < $dtd_base_folder$dtd_file
    
  done  

done