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RedHat 9 (Linux i386) - man page for consoletype (redhat section 1)

CONSOLETYPE(1)						      General Commands Manual						    CONSOLETYPE(1)

NAME
consoletype - print type of the console connected to standard input
SYNOPSIS
consoletype
DESCRIPTION
consoletype prints the type of console connected to standard input. It prints vt if console is a virtual terminal (/dev/tty* or /dev/con- sole device if not on a serial console), serial if standard input is a serial console (/dev/console or /dev/ttyS*) and pty if standard input is a pseudo terminal.
RETURN VALUE
consoletype returns 0 if on virtual terminal 1 if on serial console 2 if on a pseudo terminal.
RH
Red Hat, Inc CONSOLETYPE(1)