Change Ubuntu wallpaper from CLI

README.md

Bash script to change Ubuntu background image from CLI with random Picsum image

Installation

wget https://gist.githubusercontent.com/senorihl/98ecc6e0bd38e4b6b6f2bad09cf022d4/raw/picsum-wallpaper.sh -O $HOME/picsum-wallpaper
chmod a+x $HOME/picsum-wallpaper 

Usage

~/picsum-wallpaper

picsum-wallpaper.sh

#!/usr/bin/env bash

DRY=false
VERBOSE=false
WIDTH=$((1920*2))
HEIGHT=$((1080*2))

print_message () {
    echo -e "[$(date -u +"%Y-%m-%dT%H:%M:%SZ")] \033[36m$1\033[0m" || true
}

command () {
    local  __resultvar=$2
    local command_to_run=$1

    [[ "$VERBOSE" = "true" ]] && print_message "$command_to_run" || true
    

    if [[ "$DRY" = "false" ]]; then
        if [[ "$__resultvar" ]]; then
            eval "$__resultvar=\`$command_to_run\`"
        else
            eval $command_to_run
        fi
    fi
}

command "pgrep gnome-session | head -1" GNOME_PID
command "echo \"/proc/$GNOME_PID/environ\"" PROC_FILE
command "echo \"\$(grep -z DBUS_SESSION_BUS_ADDRESS $PROC_FILE|cut -d= -f2-)\"" BUS_ADDRESS
command "export DBUS_SESSION_BUS_ADDRESS=$BUS_ADDRESS"
command "gsettings get org.gnome.desktop.background picture-uri | sed \"s/file:\\\/\\\///g\"" previous_image
print_message "Current image is $previous_image" 
URL=https://picsum.photos/$WIDTH/$HEIGHT.jpg
command "echo '$HOME/Images/picsum-$(date -u +"%Y-%m-%dT%H:%M:%SZ").jpg'" next_image
print_message "Next image will be downloaded from $URL to $next_image" 
command "wget -qO- '$URL' > '$next_image'"
command "gsettings set org.gnome.desktop.background picture-uri 'file://$next_image'"

if [[ $previous_image == *"$HOME/Images"* ]]; then
    print_message "Removing old image $previous_image"
    command "rm -rf $previous_image"
fi