How to Permanently adjust Screen contrast Ubuntu 18.04

Question

I use xgamma -gamma 0.7 but when I restart the computer I need to write that command again.
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Sadaharu Wakisaka · Answer

You can edit $HOME/.bashrc and add the line below.
xgamma -gamma 0.7
Then each time you login, the command is executed.

waltinator · Answer

You can't do it "permanently", but you can redo the setting at every GUI login by putting a .desktop file in $HOME/.config/autostart/.
Look at examples in /etc/xdg/autostart/

How to Permanently adjust Screen contrast Ubuntu 18.04

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