Initial commit

.config/systemd/user/gnome-rotate-wallpaper.conf

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+WALLPAPER_DIR=/home/adam/Pictures/wallpaper

etc/systemd/user/gnome-rotate-wallpaper.service

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+[Unit]
+Description=Rotate GNOME wallpaper
+
+[Service]
+Type=oneshot
+Environment=DISPLAY=:0
+Environment=WALLPAPER_DIR=/home/%u/Pictures/wallpaper
+EnvironmentFile=-/home/%u/.config/systemd/user/gnome-rotate-wallpaper.conf
+ExecStart=/bin/bash /usr/local/bin/gnome_rotate_wallpaper
+
+[Install]
+WantedBy=default.target

etc/systemd/user/gnome-rotate-wallpaper.timer

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+[Unit]
+Description=GNOME rotate wallpaper
+
+[Timer]
+OnCalendar=*:0/1
+Persistent=true
+Unit=gnome-rotate-wallpaper.service
+
+[Install]
+WantedBy=default.target

readme.md

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+# Rotate Gnome Wallpaper using Systemd
+- **Note:** Adjust paths as applicable to the desired OS.
+- **Note:** The "$" represents the terminal prompt.
+- **Note:** Verified to work on Arch Linux with Gnome v3.14.
+
+## Installation Instructions
+
+1. Download "gnome-rotate-wallpaper.service", "gnome-rotate-wallpaper.timer" and "gnome_rotate_wallpaper".
+2. Move the 3 files to where Systemd user files are stored.
+```bash
+$ mv gnome-rotate-wallpaper.service gnome-rotate-wallpaper.timer /etc/systemd/user/
+```
+3. Move the BASH script "gnome_rotate_wallpaper".
+```bash
+$ mv gnome_rotate_wallpaper /usr/local/bin/
+```
+4. Set execute permissions.
+```bash
+$ chmod +x /usr/local/bin/gnome_rotate_wallpaper
+```
+5. Enable the timer.
+```bash
+$ systemctl --user enable gnome-rotate-wallpaper.timer
+```
+6. Verify the timer is enabled.
+```bash
+$ systemctl --user list-unit-files
+gnome-rotate-wallpaper.service disabled
+gnome-rotate-wallpaper.timer   enabled
+2 unit files listed.
+```
+7. Start the timer.
+```bash
+$ systemctl --user start gnome-rotate-wallpaper.timer
+```
+8. Verify the timer has been started.
+```bash
+$ systemctl --user list-timers
+NEXT                         LEFT    LAST                         PASSED UNIT                         ACTIVATES
+Thu 2016-03-10 18:49:00 CST  1s left Thu 2016-03-10 18:48:56 CST  1s ago gnome-rotate-wallpaper.timer gnome-rotate-wallpaper.service
+1 timers listed.
+Pass --all to see loaded but inactive timers, too.
+```
+
+## User Configuration
+
+### Change the default wallpaper directory.
+
+1. Create the required directories.
+```bash
+$ mkdir  ~/.config/systemd ~/.config/systemd/user
+```
+2. Create the configuration file. Replace "username" with applicable value.
+```bash
+$ nano ~/.config/systemd/user/gnome-rotate-wallpaper.conf
+```
+
+    WALLPAPER_DIR=/home/username/Pictures/wallpaper
+
+### Set the Interval to When the Wallpaper Changes.
+
+Create the timer file and then change the "OnCalendar" value to the desired interval. Refer to [ArchLinux: systemd/Timers](https://wiki.archlinux.org/index.php/Systemd/Timers#Realtime_timer) for further details.
+
+1. Create the required directories.
+```bash
+$ mkdir  ~/.config/systemd ~/.config/systemd/user
+```
+2. Create the configuration file.
+```bash
+$ nano ~/.config/systemd/user/gnome-rotate-wallpaper.timer
+```
+
+```
+[Unit]
+Description=Gnome rotate wallpaper
+
+[Timer]
+OnCalendar=*:0/1
+Persistent=true
+Unit=gnome-rotate-wallpaper.service
+
+[Install]
+WantedBy=gnome-rotate-wallpaper.service
+```
+
+## Avaliable picture-options
+
+- none
+- wallpaper
+- centered
+- scaled
+- stretched
+- zoom
+- spanned
+
+## External Links
+
+ * https://wiki.archlinux.org/index.php/Systemd/User
+ * https://wiki.archlinux.org/index.php/Systemd/Timers
+ * https://major.io/2015/02/11/rotate-gnome-3s-wallpaper-systemd-user-units-timers/
+ * https://stackoverflow.com/questions/10374520/gsettings-with-cron

screen_shield.md

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+# Change the lock screen shield
+
+
+
+# External Links
+
+- https://help.gnome.org/admin/system-admin-guide/stable/desktop-shield.html.en

usr/local/bin/gnome_rotate_wallpaper

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+#!/bin/bash
+selection=$(find $WALLPAPER_DIR -type f -name "*.jpg" -o -name "*.png" | shuf -n1)
+gsettings set org.gnome.desktop.background picture-uri "file://$selection"