How do I make a shell script that changes the background at night?

Question

All I want to do is create a shell script that runs in the background. It turns on when I log in/on boot up.

Every hour it checks the time for 9:00 pm, (if you can figure out sun sets and rises that would be great), if it is past it switches the background.

Then it changes the back if it is past 9:00 pm. But past 7:00 am it would turn that background off.

Basically just switching between 2 backgrounds. How can I do this?

Okay, thanks don't vote down I'll remove it if that question helps. — Prolight, Apr 25 '19 at 02:07
Error:/home/jpesquibel/Pictures/change_wallpaper: line 11: warning: command substitution: ignored null byte in input /home/jpesquibel/Pictures/change_wallpaper: line 14: [: 'file:///home/jpesquibel/Pictures/rd_statues.png': unary operator expected — Prolight, Apr 25 '19 at 02:39
I noticed an error in the proposed solution which I have just corrected (!= "$FILE"] needs to be != "$FILE" ] - the whitespace around [ and ] is required — steeldriver, Apr 25 '19 at 02:44
https://askubuntu.com/questions/739607/dconf-warning-failed-to-commit-changes-to-dconf-the-given-address-is-empty — Prolight, Apr 25 '19 at 02:46

score 0 · Answer 1 · answered Apr 25 '19 at 02:53

0

Automatically change Ubuntu wallpaper at a certain hour

But with this script instead:

#!/bin/bash -e
user=$(whoami)

fl=$(find /proc -maxdepth 2 -user "$user" -name environ -print -quit)
for i in {1..5}
do
  fl=$(find /proc -maxdepth 2 -user "$user" -name environ -newer "$fl" -print -quit)
done

export DBUS_SESSION_BUS_ADDRESS
DBUS_SESSION_BUS_ADDRESS=$(grep -z DBUS_SESSION_BUS_ADDRESS "$fl" | cut -d= -f2-)

IMG=$1
gsettings set org.gnome.desktop.background picture-uri "'file://${IMG}'"

answered Apr 25 '19 at 02:53

Prolight

101

This should be another answer to that question. – user535733 Apr 25 '19 at 02:55
Can you comment this code over to the current answer to that question for me? – Prolight Apr 25 '19 at 17:37
I don't have 50 reputation. – Prolight Apr 25 '19 at 17:38

How do I make a shell script that changes the background at night?

1 Answers1