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by jwilk
1270 days ago
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You can redirect stdin, but that doesn't disassociate the process from the controlling terminal: $ tty
/dev/pts/1
$ tty < /dev/null
not a tty
$ ps -q $$ -o tty= < /dev/null
pts/1
The other file descriptors referring to the terminal don't matter either: $ sh -c 'pid=$$; tty=$(ps -q $pid -o tty=); echo "$tty" > /dev/tty' <&- >&- 2>&-
pts/1
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