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lang-bash
/dev/tty, and not the controlling tty (as reported byps). (2) I believe that{ readlink /dev/fd/0; } < /dev/ttyis (and will always be) equivalent toreadlink /dev/fd/0 < /dev/tty— do you believe otherwise? If so, can you justify it? (3) The second semicolon in your command (the one after/dev/tty) is unnecessary.