Here are a few things that you can try.
https://slackbuilds.org/repository/1.../?search=xclip
xclip makes it easy to put passwords into the x11 clipboard for pasting. Using tpm for example:
Code:
tpm show foo/bar | tr -d '\n' | xclip
https://slackbuilds.org/repository/1...rch=autocutsel
autocutsel can be used to unify your clipboards and allow for sloppy copy/paste.
For example I have the following in ~/.xinitrc.
Code:
autocutsel -fork &
autocutsel -selection PRIMARY -fork &
And then I can just highlight some text with the mouse and it will be automatically added to my clipboard ready to be pasted just about anywhere. The downside is that its easy to unintentionally lose the contents of your clipboard by highlighting new text.