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@node Invoking
@chapter Invoking
@command{vtchs} ignores the command line
and the environment variables. You cannot
control its behaviour.
However, it is required that standard input
is a @file{/dev/tty} device. If this programs
is running under root,
@example
vtchs < /dev/tty1
@end example
@noindent
is sufficient. Non-root users need to find
a TTY that they have access to. If your
shell is GNU Bash, you can use
@example
vtchs < "/dev/tty$( i=1;
while true; do
if ! test -e /dev/tty$i; then
exit 1;
fi;
exec < /dev/tty$i &&
echo $i &&
exit 0 ||
: $(( i++ ));
done 2>/dev/null
)"
@end example
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