Shell Programming and Scripting

#!/bin/bash

if [ $# -eq 0 ]; then
    
echo "Syntax is: rms -{g|l|b} size1 [size2] dir"
    
exit -1

elif [ $# -ne 3 ] && [ $# -ne 4 ]; then
    
echo "Syntax is: rms -{g|l|b} size1 [size2] dir"
    
exit -1

elif [ $# -eq 3 ]; then
    
   if [ $1 != "-g" ] && [ $1 != "-l" ] ; then 
    
   echo "Incorrect..[-g,-l]"
    
   exit -1
        
   fi
    
   if [[ $2 != +([0-9]) ]]; then

   echo " $2 must be numeric!"
    
   exit -1
    
   dir=.
    
   elif [ -d $3 ]; then
    
   dir=$3
    
   else
    
   echo "Directory \"$3\" does not exist!"
    
   exit -1
    
   fi

elif [ $# -eq 4 ]; then
    
   if [ $1 -ne -b]; then
    
   echo "Incorrect...[b]"
    
   exit -1
    
   elif [ $2 -ne [0-9] ]; 
   then
    echo "$2 must be numeric!"
    
   exit -1
    
   elif [ $3 -ne [0-9] ]; then
    
   echo "$3 must be numeric!"
    
   exit -1
    
   dir=.
        
   elif [ -d $4 ]; then 
       
   dir=$4
        
   else 
        
   echo "Directory \"$4\" does not exist!"
        
   exit -1
    
   fi

else 

  echo "Syntax is: rms -{g|l|b} size1 [size2] dir"
  
exit -1

fi

if [ $1 == "-g" ]; then
    
for f in $dir/*
        
do
    
filesize=$(stat -c %s $f)
    
if [ $filesize-gt$3 ]; then
    
rm $f
    
echo "Deleted!"
    
fi
        
done

fi

#if [ $filesize-gt$3 ]; then
 if [ $filesize -gt $3 ]; then

#if [ $1 -ne -b]; then
 if [ $1 -ne -b ]; then

if [ "$#" -lt 4 ]
then
        echo "Requires at least 4 parameters"
        exit 1
fi

case "$1" in
"-b")
        echo "handle -b stuff here"
        ;;
"-g")
        echo "handle -g stuff here"
        ;;
*)
        echo "First parameter must be -b or -g"
        exit 1
        ;;
esac

shift
size1="$1"
shift
size2="$1"
shift

while [ "$#" -gt 0 ]
do
        echo "Doing stuff with $1"
        shift
done