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The names of device files in /dev vary between Unix variants. There are a few that you'll find everywhere, such as /dev/tty meaning the current terminal. It seems that /dev/tty3a is the name of the fourth serial port¹ on some Unix variants including Solaris and SCO OpenServer. The Linux equivalent would be /dev/ttyS3. So ls|tee /dev/tty3a duplicates the ...


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The example you found in a book show that you can write on your own and other terminals screen at the same time. Login two times on the same server and run wand you get something like: $ w USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT joe pts/1 :0 21:53 0.00s 0.04s 0.00s w joe pts/2 :0 22:38 3.00s 0.01s 0.01s /bin/bash At ...



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