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detecting serial console from a shell-script


Is there a way to detect that nature of the console from a shell script?
I have an auto-install script that should perform differently whether
console is serial or BIOS. 

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"

Emmanuel Dreyfus

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