I have seen that plymouth themes in different distros are the same they just put a logo or a word..so if I want to put whatever I want...can somebody tell me with what program or editing what file?
You cannot put whatever you want, but you can choose from different themes. That is because Plymouth themes are basically animated images, to customize them is not as easy as editing a text file or an image with The Gimp. You can try to create your own theme using these guides:
Otherwise you can choice from existing themes:
Just install one of these package, then from the terminal type:
You will be prompted to choose your theme, so choose it :)
Then, last command:
If you are happy with the rest of the theme, you can just replace the logo. In a terminal do the following:
To restore the old logo, simply do:
To test the theme without rebooting, you can run the following within a GNOME session to see a multi-window setup running your theme:
It seems that you made a mistake in this line:
I think that unless you it:
it will never leave plymouth.