Shell Programming and Scripting

#!/bin/bash

function DRAW_DEPTH () {
 ROUND=$1
 while [ $ROUND -ge 0 ]
 do
   printf %s "    "
   ROUND=`expr $ROUND - 1`
 done
 printf %s "|- "
}

function MAIN () {
 
 TAB=`DRAW_DEPTH $DEPTH`
 
 DIR_LIST=`ls -l $1 | awk '{print $9}'`
 for i in $DIR_LIST
 do
   # Si es un directorio entonces vamos por aki
   
   if [ -d ${1}/${i} ]; then
     if [ -d ${2}/${i} ]; then
       echo "$TAB (OK) ${1}/${i} is a directory, it exist in ${2}"
       DEPTH=`expr $DEPTH + 1`
       MAIN ${1}/${i} ${2}/${i}
       DEPTH=`expr $DEPTH - 1`
       TAB=`DRAW_DEPTH $DEPTH` 
     else
       echo "$TAB (**) ${1}/${i} is a directory, it does NOT exist in ${2}"
     fi

   else    

     # Si no es un directorio miramos primero si es un LINK
     if [ -h ${1}/${i} ]; then
       if [ -h ${2}/${i} ]; then
         checksum_1=`sum ${1}/${i} | awk '{print $1}'`
         checksum_2=`sum ${2}/${i} | awk '{print $1}'`
         if [ $checksum_1 == $checksum_2 ]; then
           echo "$TAB (OK) $i exists as LINK in $1 and in $2 and they're EQUAL"
         else
           echo "$TAB (@@) $i exists as LINK in $1 and in $2 but they DIFFER"
         fi
       else
         echo "$TAB (**) $i exists as LINK in $1 but does NOT exist in $2"
       fi
     else
       if [ -e ${2}/${i} ]; then
         checksum_1=`sum ${1}/${i} | awk '{print $1}'`
         checksum_2=`sum ${2}/${i} | awk '{print $1}'`
         if [ $checksum_1 == $checksum_2 ]; then
           echo "$TAB (OK) $i exists in $1 and in $2 and they're EQUAL"
         else
           echo "$TAB (@@) $i exists in $1 and in $2 but they DIFFER"
         fi
       else
         echo "$TAB (**) $i exists in $1 but does NOT exist in $2"
       fi
     fi
   fi 
done;
}

DEPTH=-1
MAIN $1 $2

DIR_LIST=`command ls -l $1 | awk '{print $9}'`