Saran Sankaran's questions

I installed Telegram by visiting https://desktop.telegram.org/ and downloaded a tar.xz file. After which I ran

tar -xJf telegram.tar.xz

which uncompressed the tar.xz file and gave me Telegram and Updater in a folder.

Both the files have an executable (application/x-executable) as their type. I installed Telegram by double clicking the Telegram file.

Now, I'm not sure how do I uninstall it. I tried

apt remove telegram

but it said "Unable to locate package telegram" since it wasn't installed from apt. How do I properly uninstall Telegram Desktop?

I am trying to create a script, which will change the wallpaper automatically when run.

#!/bin/bash

cd ~/
rm -r ~/.wallpaper
mkdir .wallpaper
cd ~/.wallpaper

wget https://source.unsplash.com/random/1920x1080
USER=$(whoami)
PATH="file:///home/$USER/.wallpaper/1920x1080"
echo $PATH
gsettings set org.gnome.desktop.background picture-uri "$PATH"

But when i do ./change_wallpaper.sh I get the echo correctly, but then

./change_wallpaper.sh: line 12: gsettings: command not found

However, when I run the same command from terminal, it executes fine and wallpaper is getting changed.

When I run whereis gsettings it tells

gsettings: /usr/bin/gsettings /usr/share/man/man1/gsettings.1.gz

Why is it showing gsettings: command not found when I execute from script?