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redirection to tty** with cat

 
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# 1  
Old 11-02-2001
Question redirection to tty** with cat
I tried to cat a file to another user that was logged in, but I received an error message that displayed something like:

%cat funny > /dev/ttyp3
zsh: permission denied: /dev/ttyp3

Thank you all for your help
# 2  
Old 11-02-2001
This is the way it's supposed to work. Since that other user owns /dev/ttyp3 he could "chmod 666 /dev/ttyp3" but this is very dangerous.

Some terminals have an escape sequence that will cause them to transmit the current line just as if it had been typed. On those terminals, you could send a command, then send cursor motion commands, and finally send that transmit escape sequence. This means that anyone on the system can execute any command as that user.
 
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