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Re: detecting serial console from a shell-script (Emmanuel Dreyfus) writes:

>sysctl kern.consdev seems to give the answer. How reliable is it? Can I
>take for granted that this command will detect a serial console?
>/sbin/sysctl kern.consdev | egrep -q '= tty0[0-3]$' && echo "serial"

It may depend on the platform what is considered a serial device. But
since you asked about BIOS or serial you are probably looking only at

But I'm curious, what does this distinction give you? Either console
is a just 'a terminal'.

                                Michael van Elst
                                "A potential Snark may lurk in every tree."

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