I'm trying to add a program path /usr/bin/xscreensaver-demo, to file so my screensaver will start at boot. But I can't save it. I don't have the permission to change it and save it.
I have tried this in both Brackets and gedit.
/etc/rc.local:
# By default this script does nothing
/usr/bin/xscreensaver-demo
exit 0
I thought of using a sudo command in the terminal but I don't know what command to execute to edit that file with superuser privilege and save it.
First you'll need a text editor. Ubuntu comes with gedit by default. To run gedit with sudo privileges type sudo gedit filepath . Then you'll be asked for your sudo password, enter it and gedit window will open allowing you to edit and save the file.
If you know how to use vi/vim (even knowing how to insert/save and quit is enough) you can do the same by sudo vi filepath This opens the file in your terminal.
Seems that i'm pretty wrong here.
Courtesy of @steeldriver Why should users never use normal sudo to start graphical applications?
@GTRONICK says > For gtk applications you should use gksudo .
