diff --git a/scripts/create-a-crypted-btrfs-device.sh b/scripts/create-a-crypted-btrfs-device.sh
index 0cec6b8..715d08c 100755
--- a/scripts/create-a-crypted-btrfs-device.sh
+++ b/scripts/create-a-crypted-btrfs-device.sh
@@ -2,14 +2,15 @@
 
 : ${DEVICE:?not set}
 : ${LABEL:?not set}
-MOUNT_OPTIONS="${MOUNT_OPTIONS:-compress-force=zstd}"
 
-[[ ${EUID} -eq 0 ]]  || (echo "Please rerun this script with root privileges" && exit 1)
-[[ -f "${DEVICE}" ]] || echo "${DEVICE} not found"
+: "${MOUNT_OPTIONS:=compress-force=zstd}"
 
-cryptsetup luksFormat "${DEVICE}"
-cryptsetup luksOpen "${DEVICE}" "${LABEL}"
-mkfs.btrfs --label "${LABEL}" "/dev/mapper/${LABEL}"
-mount --types btrfs --options "${MOUNT_OPTIONS}" "/dev/mapper/${LABEL}" "/mnt/${LABEL}"
+[[ $EUID -eq 0 ]]  || (echo "Please rerun this script with root privileges" && exit 1)
+[[ -f "$DEVICE" ]] || echo "${DEVICE} not found"
+
+cryptsetup luksFormat "$DEVICE"
+cryptsetup luksOpen "$DEVICE" "$LABEL"
+mkfs.btrfs --label "$LABEL" "/dev/mapper/${LABEL}"
+mount --types btrfs --options "$MOUNT_OPTIONS" "/dev/mapper/${LABEL}" "/mnt/${LABEL}"
 umount "/mnt/${LABEL}"
-cryptsetup luksClose "${DEVICE}"
+cryptsetup luksClose "$DEVICE"
diff --git a/scripts/decrypt-files-in-repo.sh b/scripts/decrypt-files-in-repo.sh
index a8e6b07..0fdecc9 100755
--- a/scripts/decrypt-files-in-repo.sh
+++ b/scripts/decrypt-files-in-repo.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env sh
 
-TOP_LEVEL="$(git rev-parse --show-toplevel)"
+: "${TOP_LEVEL:=$(git rev-parse --show-toplevel)}"
 
 echo "Decrypting files…"
 
diff --git a/scripts/opensuse/pi.config.sh b/scripts/opensuse/pi.config.sh
deleted file mode 100755
index fca7b20..0000000
--- a/scripts/opensuse/pi.config.sh
+++ /dev/null
@@ -1,8 +0,0 @@
-#!/usr/bin/env sh
-
-USER_FULL_NAME='Mek'
-USER_NAME='mek'
-USER_PASSWORD="${USER_PASSWORD:?'not set'}"
-USER_TYPE='local'
-
-yast users add batchmode verbose type="${USER_TYPE}" username="${USER_NAME}" password="${USER_PASSWORD}" cn="${USER_FULL_NAME}"
diff --git a/scripts/opensuse/pi.setup.sh b/scripts/opensuse/pi.setup.sh
new file mode 100755
index 0000000..3eccace
--- /dev/null
+++ b/scripts/opensuse/pi.setup.sh
@@ -0,0 +1,12 @@
+#!/usr/bin/env sh
+
+: "${USER_FULL_NAME:='Mek'}"
+: "${USER_NAME:='mek'}"
+: "${USER_PASSWORD:?'not set'}"
+: "${USER_TYPE:='local'}"
+
+yast users add batchmode verbose \
+	type="$USER_TYPE" \
+	username="$USER_NAME" \
+	password="$USER_PASSWORD" \
+	cn="$USER_FULL_NAME"
diff --git a/scripts/raspberry pi os/docker.install.bash b/scripts/raspberry pi os/docker.install.bash
index 9280f37..12c9313 100755
--- a/scripts/raspberry pi os/docker.install.bash	
+++ b/scripts/raspberry pi os/docker.install.bash	
@@ -3,7 +3,7 @@
 set -e
 
 sudo curl -fsSL https://get.docker.com | sh -
-sudo usermod -aG docker ${USER}
+sudo usermod -aG docker $USER
 
 # logout && login to apply the new status
 
diff --git a/scripts/reset-wifi-if-no-internet-connection.bash b/scripts/reset-wifi-if-no-internet-connection.bash
index 08584a1..9eff64c 100755
--- a/scripts/reset-wifi-if-no-internet-connection.bash
+++ b/scripts/reset-wifi-if-no-internet-connection.bash
@@ -1,21 +1,21 @@
 #!/usr/bin/env bash
 
-interface="wlan0"
+: "${INTERFACE:='wlan0'}"
 
-max_retries=3
-timeout=1
+: ${MAX_RETRIES:=3}
+: ${TIMEOUT:=1}
 
-log_path="$(dirname $0)/$(basename $0).log"
-log_prefix="$(date +'%Y-%m-%d %T')"
+: "${LOG_PATH=$(dirname $0)/$(basename $0).log}"
+: "${LOG_PREFIX=$(date +'%Y-%m-%d %T')}"
 
 i=0
-until [ $i -eq $max_retries ]; do
+until [ $i -eq $MAX_RETRIES ]; do
 	let "i++"
-	if nc -Nz -w $timeout www.google.com 443; then
-		echo "$log_prefix" "connection is OK" >> $log_path
+	if nc -Nz -w $TIMEOUT www.google.com 443; then
+		echo "$LOG_PREFIX" "connection is OK" >> $LOG_PATH
 		break
 	else
-		echo "$log_prefix" "no connection, resetting interface" >> $log_path
-		sudo ifconfig wlan0 down && sudo ifconfig wlan0 up
+		echo "$LOG_PREFIX" "no connection, resetting interface" >> $LOG_PATH
+		sudo ifconfig $INTERFACE down && sudo ifconfig $INTERFACE up
 	fi
 done