how to download and chage wall paper im using start x during start up

What distro?

If you are using Ubuntu, check out this link: https://apps.ubuntu.com/cat/applications/raring/wallch/

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When issuing command startx, the Desktop Environment kicks in on top of the X server. Basically you get a GUI. Changing the wallpaper heavily depends on that Environment. In the Linux world, there are many of them, e.g. KDE (K Desktop Environment), GNOME, Unity, Cinnamon, etc. We should know what distribution you're on and which desktop environment you're using for us to be able to help you properly.

Feh works in my wallpaper folder in ~/Wallpaper.

Edit. Right click when viewing image explains all. I use Window Managers though.

$ sudo apt-get install xloadimage
(for debian at least)

$ xsetbg background.png

beyond that it's how you start your GUI that can get in the way. I use startx so:

FILE: $HOME/.xinitrc
Various display managers can trigger a background: lightdm, gdm, kdm, xdm, wdm, slim, ... ... ...

Starting other things can trigger backgrounds: nautilus, switching de's from a de, ... ... ...

Installed by default is a utility xsetroot. Not so useful for images, but you can use it to set the background to solid colors or patterns.

$ xsetroot -solid rgb:00/44/00
$ xsetroot -solid Blue4
$ xsetroot -bitmap /usr/include/X11/bitmaps/plaid
$ xsetroot -bitmap /usr/include/X11/bitmaps/scales
$ xsetroot -bitmap /usr/include/X11/bitmaps/root_weave
$ xsetroot -bitmap /usr/include/X11/bitmaps/wide_weave

1 members found this post helpful.

You probably don't need the special programs mentioned in posts 4 and 5. Create a safe place for keeping the pictures you download, like ~/.wallpaper. Then open your image viewer, view the picture you want, and somewhere in its menu should be the option to set the image as wallpaper. When you have several images that have been used, you can probably change by right-clicking on the desktop and getting the option to change the background. That should enable you to see all the backgrounds installed by the distro or by you, unless you are using a very basic window manager.

You can right click on the desktop and select change wallpaper. You'll need to have your pictures in the /home/user/Pictures directory. At least that's how it works with gnome3.