Option to make background black

README.md

@@ -57,6 +57,17 @@ $ ls /boot/EFI/BOOT
 BOOTX64.EFI BOOTX64.PNG
 ```
 
+To change a background, run `set-background.sh`, for example:
+```bash
+$ chmod +x ./set-background.sh
+$ ./set-background.sh
+Available backgrounds (./backgrounds):
+  1) black.png
+  2) ursamajor.png
+Enter the number of background to set: 1
+Success: black.png has been set as background.
+```
+
 ## Additional Information
 
 Additional information about configuring rEFInd may be found [here](http://www.rodsbooks.com/refind/configfile.html).

set-background.sh

@@ -0,0 +1,34 @@
+#!/bin/bash
+
+echo "Available backgrounds (./backgrounds):"
+a=$(ls ./backgrounds)
+c=0
+for i in $a
+do
+    c=$(($c+1))
+    printf "%3d) %s\n" $c $i
+done
+
+r=
+read -p "Enter the number of background to set: " r
+
+RED="\033[1;31m"
+GREEN="\033[1;32m"
+NC="\033[0m"
+
+if ! ( echo $r | grep -qP "^\d+$" ) || [ $r -lt 1 ] || [ $r -gt $c ]
+then
+    printf "${RED}Error:${NC} incorrect number.\n"
+else
+    i=0
+    for el in $a
+    do
+        i=$(($i+1))
+        if [ $i -eq $r ]
+        then
+            cp "./backgrounds/${el}" background.png
+            printf "${GREEN}Success:${NC} ${el} has been set as background.\n"
+            break
+        fi
+    done
+fi