diff --git a/init.sh b/init.sh
index 9214a3a..c12304b 100755
--- a/init.sh
+++ b/init.sh
@@ -124,13 +124,10 @@ download (){
 # $2 : url
 # $3 : 1 if abort download if file exist
 printf "Downloading %s :    " "$1"
-local url
-local http_response
-url="$2/$1"
-http_response=$(wget --spider --server-response "$url" 2>&1 | grep HTTP/ | tail -1 |  awk ' { printf $2 }')
-if [ "$http_response" -eq 200 ]
+http_response=$(wget --spider --server-response $2/$1 2>&1 | grep HTTP/ | tail -1 |  awk ' { printf $2 }')
+if [ $http_response -eq 200 ]
 then
-    wget -c --progress=dot "$url" 2>&1 | grep --line-buffered "[0-9]\{1,3\}%" -o | awk '{printf ("\b\b\b\b%4s", $1)}'
+    wget -c --progress=dot $2/$1 2>&1 | grep --line-buffered "[0-9]\{1,3\}%" -o | awk '{printf ("\b\b\b\b%4s", $1)}'
     if [ $? -eq 0 ]
     then
         printf " \b\b\b\b\b done\n "
@@ -145,81 +142,79 @@ fi
 }
 
 process_conf_file (){
-    while read -r p
-    do
-        var=$(echo "$p" | awk -F"=" '{print $1}')
-        param=$(echo "$p" | awk -F"=" '{print $2}')
-        eval "$var"="$param"
-    done < <( cat "$1" | grep '^[^#].*')
-
+for p in `cat $1 | grep '^[^#].*'`
+do
+   var=`echo "$p" | awk -F"=" '{print $1}'`
+   param=`echo "$p" | awk -F"=" '{print $2}'`
+   eval $var=$param
+done
 }
 
 create_dir(){
 # $1 directory to create
-    if [ ! -d "$1" ]
-    then 
-        mkdir -p "$1"
-    else
-        if [ -n "$2" ] && [ "$2" -eq 1 ] 
-        then
-            rm -rf "$1"
-            create_dir "$1"
-        fi
+if [ ! -d $1 ]
+then 
+    mkdir -p $1
+else
+    if [[ $2 == 1 ]]
+    then
+        rm -rf $1
+        create_dir $1
     fi
+fi
 }
 
 # unmount if device is mounted
 umount_device (){
-    local mounted_part=""
-    mounted_part=$(mount | grep "${1}[0-9]" | awk '{print $3}')
-    if [ !  "$mounted_part" == "" ]
-    then
-        for part  in $mounted_part
-        do
-            if [ -d "$part" ]
-            then
-                printf "Unmount %s\n " "$part"
-                umount "$part" --recursive
-            fi
-        done
-    fi
+local mounted_part=$(mount | grep "${1}[0-9]" | awk '{print $3}')
+if [ !  "$mounted_part" == "" ]
+then
+    for part in $mounted_part
+    do
+        if [ -d $part ]
+        then
+            printf "Unmount %s\n " "$part"
+            umount $part --recursive
+        fi
+    done
+fi
 }
 
 efi_create_key_structure () {
-    parted -s "$1" mklabel gpt mkpart EFS fat32 1MiB 128MiB set 1 boot on mkpart debian fat32 128MiB 100%
+    parted -s $1 mklabel gpt mkpart EFS fat32 1MiB 128MiB set 1 boot on mkpart debian fat32 128MiB 100%
     sleep 2
-    mkfs.vfat "${1}1" -n efi &> /dev/null
-    mkfs.vfat "${1}2" -n debian &> /dev/null
+    mkfs.vfat ${1}1 -n efi &> /dev/null
+    mkfs.vfat ${1}2 -n debian &> /dev/null
     sync
-    mount "${1}2" "$2"
-    create_dir "$2/efi"
-    mount "${1}1" "$2/efi"
+    mount ${1}2 $2
+    create_dir $2/efi
+    mount ${1}1 $2/efi
 }
 
 bios_create_key_structure() {
-    parted -s "$1" mklabel msdos mkpart primary fat32 1MiB 100% set 1 boot on
+    parted -s $1 mklabel msdos mkpart primary fat32 1MiB 100% set 1 boot on
     sleep 2
-    mkfs.vfat "${1}1" -n debian &> /dev/null
-    mount "${1}1" "$2"
+    mkfs.vfat ${1}1 -n debian &> /dev/null
+    mount ${1}1 $2
 }
 
 #Stop script if syslinux is not installed
-if [ -z  "$SYSLINUX_EXE" ]
+if [ -z  $SYSLINUX_EXE ]
 then
     printf "Syslinux not found, script can't continue.\n"
     exit 1
 fi
 
-if [ -z "$PARTED_EXE" ]
+if [ -z $PARTED_EXE ]
 then 
     printf "Parted not found, script can't continue.\n"
     exit 1
 fi
 
 
-process_args "$@"
-process_conf_file "$conf_file"
-if [[ ! -d "$syslinux_mbr_bl_folder" || ! -d "$syslinux_efi_bl_folder" || ! -d "$syslinux_modules_folder" ]]
+process_args $@
+process_conf_file $conf_file
+if [[ ! -d $syslinux_mbr_bl_folder || ! -d $syslinux_efi_bl_folder || ! -d $syslinux_modules_folder ]]
 then
     printf "Bad folder configuration in %s\n" "$conf_file"
     exit 1
@@ -240,64 +235,64 @@ repo_path="$repo_dir/$debian_arch/$debian_version"
 printf "Downloading Debian files\n---\n"
 
 # Création du répertoire temporaire
-create_dir "$repo_path"
-cd "$repo_path"
+create_dir $repo_path
+cd $repo_path
 
-download "$iso_file" "$iso_url" 1
+download $iso_file $iso_url 1
 for file in "vmlinuz" "initrd.gz" 
 do
-    download "$file" "$bootfiles_Debian" 1
+    download $file $bootfiles_Debian 1
 done
-cd "$current_dir"
+cd $current_dir
 
-if [ -z "$device" ]
+if [ -z $device ]
 then
     printf "No destination device specified, USB key will not be created.\n"
 fi
-create_dir "$tmp_dir" 1
-cp "$repo_path/$iso_file" "$tmp_dir"
+create_dir $tmp_dir 1
+cp $repo_path/$iso_file $tmp_dir
 # Copy wanted syslinux file from archive
 
 case $boot_type in
     efi64)
         syslinux_folder=${tmp_dir}/efi/EFI/boot
-        create_dir "$syslinux_folder"
-        cp -T "$syslinux_efi_bl_folder/$boot_type/syslinux.efi" "$syslinux_folder/bootx64.efi" &> /dev/null
+        create_dir $syslinux_folder
+        cp -T $syslinux_efi_bl_folder/$boot_type/syslinux.efi $syslinux_folder/bootx64.efi &> /dev/null
         for file in $SYSLINUX_EFI_FILES
         do
             printf "copying %s \n" "$file"  
-            cp "$syslinux_modules_folder/$boot_type/$file" "$syslinux_folder" 
+            cp $syslinux_modules_folder/$boot_type/$file $syslinux_folder 
         done
-        cp "$repo_path"/{vmlinuz,initrd.gz} "$tmp_dir/efi"
-        cp -R syslinux/syslinux.cfg "$syslinux_folder" &> /dev/null
+        cp $repo_path/{vmlinuz,initrd.gz} $tmp_dir/efi
+        cp -R syslinux/syslinux.cfg $syslinux_folder &> /dev/null
 
         ;; 
     bios)
         syslinux_folder=${tmp_dir}/syslinux
-        create_dir "$syslinux_folder"
+        create_dir $syslinux_folder
         for file in $SYSLINUX_BIOS_FILES
         do
-            printf "copying %s\n" "$file"   
-            cp "$syslinux_modules_folder/$boot_type/$file" "$syslinux_folder"
+            prin tf "copying %s\n" "$file"   
+            cp $syslinux_modules_folder/$boot_type/$file $syslinux_folder
         done
-        cp "$repo_path"/{vmlinuz,initrd.gz} "$tmp_dir"
-        cp -R syslinux  "$tmp_dir" &> /dev/null
+        cp $repo_path/{vmlinuz,initrd.gz} $tmp_dir
+        cp -R syslinux  $tmp_dir &> /dev/null
         ;;
 esac
 
 for file in $SYSLINUX_FILES
 do
     printf "copying %s\n" "$file"    
-    cp "$syslinux_modules_folder/$boot_type/$file" "$syslinux_folder"
+    cp $syslinux_modules_folder/$boot_type/$file $syslinux_folder
 done
 
 echo Copying configurations files 
-create_dir "$tmp_dir/partman_recipes"
-cp -R partman_recipes "$tmp_dir" &> /dev/null
-create_dir "$tmp_dir/preseeds"
-cp -R preseeds "$tmp_dir" &> /dev/null
+create_dir $tmp_dir/partman_recipes
+cp -R partman_recipes $tmp_dir &> /dev/null
+create_dir $tmp_dir/preseeds
+cp -R preseeds $tmp_dir &> /dev/null
 
-if [ -n "$device" ]
+if [ ! -z $device ]
 then
     printf "Partitionning and formating %s\n" "$device"
     read -p "[WARNING] Disk $device will be erased continue [Y/N]? " -n 1 -r
@@ -306,31 +301,31 @@ then
        exit 1
     fi
     printf "\n\n"
-    umount_device "$device"
-    create_dir "$key_mountpoint"
+    umount_device $device
+    create_dir $key_mountpoint
     #dd if=/dev/zero of=${dest} bs=512 count=1 conv=notrunc &> /dev/null
-    case "$boot_type" in
+    case $boot_type in
         "efi64") 
-            efi_create_key_structure "$device" "$key_mountpoint"
+            efi_create_key_structure $device $key_mountpoint
             ;; 
         "bios")
-            bios_create_key_structure "$device" "$key_mountpoint"
+            bios_create_key_structure $device $key_mountpoint
             ;;
     esac
     printf "copying all file to USB drive\n"
-    cp -R "$tmp_dir"/* "$key_mountpoint"
-    umount_device "$device" 
+    cp -R $tmp_dir/* $key_mountpoint
+    umount_device $device 
     sleep 5
     # Make key bootable if bios.
-    if [ "$boot_type" = "bios" ]
+    if [ $boot_type = "bios" ]
     then
         # In this mode, we need to write syslinux MBR.
         printf "Writing syslinux mbr.ini to %s\n"  "$device"
-        dd bs=440 count=1 conv=notrunc if="$syslinux_mbr_bl_folder"/mbr.bin of="$device"
+        dd bs=440 count=1 conv=notrunc if=$syslinux_mbr_bl_folder/mbr.bin of=$device
         sleep 2
-        "$SYSLINUX_EXE" --directory /syslinux --install "${device}1"
+        $SYSLINUX_EXE --directory /syslinux --install ${device}1
     fi 
-    rm -rf "$tmp_dir"
+    rm -rf $TMP_DIR
     printf "\nBootable USB key created\n"
     exit 0 
 fi