Review shell scripts

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

hosts/eirene/hardware/scripts/card.sh

@@ -1,10 +1,10 @@
 AMD=/dev/dri/by-path/pci-0000:06:00.0-card
 NVIDIA=/dev/dri/by-path/pci-0000:01:00.0-card
 
-if [[ -e "${AMD}" ]]; then
-  CARD=${AMD}
+if [[ -e "$AMD" ]]; then
+  card=$AMD
 else
-  CARD=${NVIDIA}
+  card=$NVIDIA
 fi
 
-ln -sf "${CARD}" "${HOME}"/.config/hypr/card
+ln -sf "$card" "$HOME"/.config/hypr/card

hosts/eirene/hardware/scripts/mouse.sh

@@ -5,10 +5,10 @@ SEARCH_STRINGS=(
 )
 
 for search_string in "${SEARCH_STRINGS[@]}"; do
-  echo "Searching for devices matching: ${search_string}"
+  echo "Searching for devices matching: $search_string"
 
-  for f in $(grep -l "${search_string}" /sys/bus/usb/devices/*/product 2>/dev/null | sed "s/product/power\\/control/"); do
-    echo "Setting power control to 'on' for: ${f}"
-    echo on >| "${f}"
+  for f in $(grep -l "$search_string" /sys/bus/usb/devices/*/product 2>/dev/null | sed "s/product/power\\/control/"); do
+    echo "Setting power control to 'on' for: $f"
+    echo on >| "$f"
   done
 done