fixed the fc-cache check

install.sh

@@ -15,13 +15,13 @@ else
 fi
 
 # Copy all fonts to user fonts directory
+echo "Copying fonts..."
 eval $find_command | xargs -0 -I % cp "%" "$font_dir/"
 
 # Reset font cache on Linux
-if [[ `uname` != 'Darwin' ]]; then
-  if [[ -n `which fc-cache` ]]; then
+if command -v fc-cache @>/dev/null ; then
+    echo "Resetting font cache, this may take a moment..."
     fc-cache -f $font_dir
-  fi
 fi
 
 echo "All Powerline fonts installed to $font_dir"