diff --git a/bash/ovh-rescue.sh b/bash/ovh-rescue.sh
index 4487403..e63c7b2 100644
--- a/bash/ovh-rescue.sh
+++ b/bash/ovh-rescue.sh
@@ -1,12 +1,12 @@
-#! /usr/bin/env bash
+#! /usr/bin/env sh
 
 ovh_rescue_configure() {
 local host="${1}"
     local packages=(
-    'byobu' 'mosh'
+    "byobu" "mosh"
     )
     # apt / conf
-    echo -n "\
+    printf "\
 Acquire::AllowInsecureRepositories False;
 Acquire::AllowWeakRepositories False;
 Acquire::AllowDowngradeToInsecureRepositories False;
@@ -16,26 +16,26 @@ APT::Install-Suggests False;
 APT::Get::Show-Versions True;
 Dir::Etc::SourceParts '';
 Dpkg::Progress True;
-" > '/etc/apt/apt.conf'
+" > "/etc/apt/apt.conf"
     # apt / sources
-    echo -n "\
+    printf "\
 deb https://deb.debian.org/debian buster main contrib non-free
 deb https://deb.debian.org/debian buster-backports main contrib non-free
 deb https://deb.debian.org/debian buster-updates main contrib non-free
 deb https://deb.debian.org/debian-security buster/updates main contrib non-free
-" > '/etc/apt/sources.list'
+" > "/etc/apt/sources.list"
     # bash / rc
     main_link_bashrc
     # host name
     hostname "${host}"
     # locales
-    echo -n "\
+    printf "\
 en_US.UTF-8 UTF-8
 fr_FR.UTF-8 UTF-8
 " > '/etc/locale.gen'
     # fix alias
-    rm --force '/usr/share/locale/locale.alias'
-    ln --symbolic '/etc/locale.alias' '/usr/share/locale/locale.alias'
+    rm --force "/usr/share/locale/locale.alias"
+    ln --symbolic "/etc/locale.alias" "/usr/share/locale/locale.alias"
     # generate locales
     locale-gen
     # update catalog
@@ -48,25 +48,25 @@ fr_FR.UTF-8 UTF-8
     apt_clean_cache
 }
 
-function ovh-rescue-install {
-    local release='buster'
+ovh_rescue_install() {
+    local release="buster"
     local packages=(
     # installed
-    'parted' 'mdadm' 'lvm2'
+    "parted" "mdadm" "lvm2"
     # install
-    'lshw'
-    'file' 'micro'
-    'grub-efi-amd64-bin' 'grub-pc-bin'
-    'htop' 'iotop' 'lsof'
-    'exa' 'ncdu' 'nnn' 'ranger' 'tree'
-    'squashfs-tools'
-    'uuid-runtime'
+    "lshw"
+    "file" "micro"
+    "grub-efi-amd64-bin" "grub-pc-bin"
+    "htop" "iotop" "lsof"
+    "exa" "ncdu" "nnn" "ranger" "tree"
+    "squashfs-tools"
+    "uuid-runtime"
     )
     local backports=(
     # installed
-    'cryptsetup-bin' 'rsync'
+    "cryptsetup-bin" "rsync"
     # install
-    'git'
+    "git"
     )
     # update catalog
     apt-get update
@@ -87,27 +87,28 @@ function ovh-rescue-install {
     apt_clean_cache
 }
 
-function ovh-rescue-upload {
+ovh_rescue_upload() {
 local host="${1}"
 if [ "${host}" ] ; then
-    local user='root'
+    local user="root"
     #
     local user_host="${user}@${host}"
     # remove fingerprints
     ssh-keygen -R "${host}"
     # copy ssh id
     ssh-copy-id \
-    -o 'StrictHostKeyChecking=accept-new' \
+    -o "StrictHostKeyChecking=accept-new" \
     "${user_host}"
     # upload root
     rsync --delete --recursive "${MAIN_BASH_ROOT}/" "${user_host}:/etc/bash/"
     # call setup
     # TODO variable
-    ssh "${user_host}" -- "source '/etc/bash/main.sh' ; ovh-rescue-configure '${host}'"
+    ssh "${user_host}" -- \
+        "source \"/etc/bash/main.sh\" ; ovh-rescue-configure \"${host}\""
     # create session
     ssh "${user_host}" -- byobu new-session -d
     # send keys
-    ssh "${user_host}" -- byobu send-keys 'ovh-rescue-install' 'C-m'
+    ssh "${user_host}" -- byobu send-keys "ovh-rescue-install" "C-m"
     # attach session
     mosh "${user_host}" -- byobu attach-session
 else
@@ -116,66 +117,66 @@ else
 fi
 }
 
-function ovh-rescue-wipe-1-2TB {
-    local device='/dev/sda'
-    local unit='mib'
+ovh_rescue_wipe_1_2TB() {
+    local device="/dev/sda"
+    local unit="mib"
     #
     lsblk
-    echo -n 'WIPE' "${device}" "/?\\ OR CANCEL /!\\"
+    printf "%s" "WIPE ${device} /?\\ OR CANCEL /!\\"
     read -r
     #
     parted "${device}" --script mktable gpt
     #
-    parted "${device}" unit "${unit}" mkpart 'crypt' 65795 1907729
+    parted "${device}" unit "${unit}" mkpart "crypt" 65795 1907729
     #
-    parted "${device}" unit "${unit}" mkpart 'boot' 259 65795
+    parted "${device}" unit "${unit}" mkpart "boot" 259 65795
     #
-    parted "${device}" unit "${unit}" mkpart 'esp' 2 259
+    parted "${device}" unit "${unit}" mkpart "esp" 2 259
     parted "${device}" set 3 esp on
     #
     parted "${device}" unit "${unit}" mkpart bios 1 2
     parted "${device}" set 4 bios_grub on
     # wipe bios
-    dd if='/dev/zero' of='/dev/sda4'
+    dd if="/dev/zero" of="/dev/sda4"
     # format esp
-    mkfs.vfat -F 32 -n 'esp' '/dev/sda3'
+    mkfs.vfat -F 32 -n "esp" "/dev/sda3"
     # format boot
-    mkfs.ext4 -F -L 'boot' '/dev/sda2'
+    mkfs.ext4 -F -L "boot" "/dev/sda2"
     # read passphrase
     local passphrase
-    echo -n 'PassPhrase: '
+    printf "PassPhrase: "
     read -r -s passphrase
     # encrypt
     echo "${passphrase}" \
     | cryptsetup \
     --verbose \
     --batch-mode \
-    --type 'luks2' \
-    --pbkdf 'argon2id' \
-    --cipher 'aes-xts-plain64' \
+    --type "luks2" \
+    --pbkdf "argon2id" \
+    --cipher "aes-xts-plain64" \
     --iter-time 8192 \
     --key-size 512 \
-    --hash 'sha512' \
+    --hash "sha512" \
     --use-random \
     luksFormat \
-    '/dev/sda1'
+    "/dev/sda1"
     # open
     echo "${passphrase}" \
-    | cryptsetup luksOpen '/dev/sda1' 'crypt'
+    | cryptsetup luksOpen "/dev/sda1" "crypt"
     # pv
-    pvcreate '/dev/mapper/crypt'
+    pvcreate "/dev/mapper/crypt"
     # vg
-    vgcreate 'crypt' '/dev/mapper/crypt'
+    vgcreate "crypt" "/dev/mapper/crypt"
     # lv swap
-    lvcreate --name 'swap' --size '68719476736b' 'crypt'
+    lvcreate --name "swap" --size "68719476736b" "crypt"
     # lv data
-    lvcreate --name 'data' --extents '100%FREE' 'crypt'
+    lvcreate --name "data" --extents "100%FREE" "crypt"
     # format swap
-    mkswap --label 'swap' '/dev/mapper/crypt-swap'
+    mkswap --label "swap" "/dev/mapper/crypt-swap"
     # format data
-    mkfs.ext4 -L 'data' '/dev/mapper/crypt-data'
+    mkfs.ext4 -L "data" "/dev/mapper/crypt-data"
     # vg off
-    vgchange --activate n 'crypt'
+    vgchange --activate "n" "crypt"
     # close
-    cryptsetup luksClose 'crypt'
+    cryptsetup luksClose "crypt"
 }