Using su with screen

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Problem :

When I am under one of my user-names, I can fire off, say, screen -S -p 0 -X eval 'stuff "say command"15'. However, I cannot su username screen -S -p 0 -X eval 'stuff "say command"15'; it complains that permission is denied. Why is this?

Solution :

The username that you’r using with su might not be a super user.

Just type like this,

su screen -S -p 0 -X eval 'stuff "say command"15'

then type your password

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