UnRAR shell script for (multiple) RAR files

#!/bin/bash

if [ -f $1'.001' 2>/dev/null ];
   then
      part='.001';

elif [ -f $1'.part1.rar' 2>/dev/null ];
   then
      part='.part1.rar';

elif [ -f $1'.part01.rar' 2>/dev/null ];
   then
      part='.part01.rar';

elif [ -f $1'.part001.rar' 2>/dev/null ];
   then
      part='.part001.rar';

elif [ -f $1'.rar' 2>/dev/null ];
   then
      part='.rar';

else
   echo Nem találtam .rar archívumot!
   exit 3
fi;

echo Tömörítek...
unrar x -y $1$part 1>/dev/null 2>rarerror.txt;

FILESIZE=`ls -al rarerror.txt | awk '{print $5}'`
if [ $FILESIZE -eq 0 ]; then
   rm -f rarerror.txt;
   rm -f $1.sfv 2>/dev/null;
   if [ $part = '.001' ]; then
      rm -f $1.0* 2>/dev/null;
      rm -f $1.1* 2>/dev/null;
      rm -f $1.2* 2>/dev/null;
      rm -f $1.3* 2>/dev/null;
      rm -f $1.4* 2>/dev/null;
      rm -f $1.5* 2>/dev/null;
      rm -f $1.6* 2>/dev/null;
      rm -f $1.7* 2>/dev/null;
      rm -f $1.8* 2>/dev/null;
      rm -f $1.9* 2>/dev/null;
   elif [ $part = '.part1.rar' ]; then
      rm -f $1.part?.rar 2>/dev/null;
   elif [ $part = '.part01.rar' ]; then
      rm -f $1.part??.rar 2>/dev/null;
   elif [ $part = '.part001.rar' ]; then
      rm -f $1.part???.rar 2>/dev/null;
   else
      rm -f $1.r* 2>/dev/null;
      rm -f $1.s0* 2>/dev/null;
      rm -f $1.s1* 2>/dev/null;
      rm -f $1.s2* 2>/dev/null;
      rm -f $1.s3* 2>/dev/null;
      rm -f $1.s4* 2>/dev/null;
      rm -f $1.s5* 2>/dev/null;
      rm -f $1.s6* 2>/dev/null;
      rm -f $1.s7* 2>/dev/null;
      rm -f $1.s8* 2>/dev/null;
      rm -f $1.s9* 2>/dev/null;
   fi;
   echo Konvertálok ...
   bchunk $1'.bin' $1'.cue' $1 1>/dev/null 2>bcerror.txt;
   FILESIZE=`ls -al bcerror.txt | awk '{print $5}'`
   if [ ! $FILESIZE -eq 0 ]; then
      cat bcerror.txt;
      echo
      rm -f bcerror.txt;
      exit 2
   else
      if [ ! -f $1'02.cdr' ]; then
         rm -f $1.bin
     rm -f $1.cue
      else
         rm -f $1'01.iso'
     rm -f $1??.cdr
         echo $1.bin NEM törölhető, audiósávot tartalmaz!
         echo
      fi;
   fi;
else
   cat rarerror.txt;
   echo
   rm -f rarerror.txt;
   exit 1
fi;
rm -f bcerror.txt;
echo Minden OK, készen vagyok!