nvidiactl: More consistant command substitution

nvidiactl/nvidiactl

@@ -55,21 +55,21 @@ test -e /lib/modules/$kver/kernel/drivers/gpu/drm/drm_kms_helper.ko && modprobe
 insmod ${leglink}/nvidia.ko
 
 # Count the number of NVIDIA controllers found.
-NVDEVS=`lspci | grep -i NVIDIA`
-N3D=`echo "$NVDEVS" | grep "3D controller" | wc -l`
-NVGA=`echo "$NVDEVS" | grep "VGA compatible controller" | wc -l`
+NVDEVS=$(lspci | grep -i NVIDIA)
+N3D=$(echo "$NVDEVS" | grep "3D controller" | wc -l)
+NVGA=$(echo "$NVDEVS" | grep "VGA compatible controller" | wc -l)
 N=$(( $N3D + $NVGA ))
 if [ ! -z $N ]; then
   N=$(( $N - 1 ))
-  for i in `seq 0 $N`; do
+  for i in $(seq 0 $N); do
    mknod -m 666 /dev/nvidia$i c 195 $i
   done
   mknod -m 666 /dev/nvidiactl c 195 255
 
   # CUDA
   if [ -e ${leglink}/nvidia-uvm.ko ]; then
     insmod ${leglink}/nvidia-uvm.ko
-    D=`grep nvidia-uvm /proc/devices | awk '{print $1}'`
+    D=$(grep nvidia-uvm /proc/devices | awk '{print $1}')
     if [ ! -z $D ]; then
       mknod -m 666 /dev/nvidia-uvm c $D 0
     fi