busybox/examples/var_service/getty_tty1/login.sh

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#!/bin/sh
ttyname=`tty`
ttybase="${ttyname%%[0123456789]*}" # strip numeric tail
if test "$ttybase" = "/dev/tty"; then
tail="${ttyname:8}"
echo "* Setting terminal device's owner to $LOGIN_UID:$LOGIN_GID"
chown "$LOGIN_UID:$LOGIN_GID" "/dev/vcs$tail" "/dev/vcsa$tail"
fi
# We can do this also, but login does it itself
# chown "$LOGIN_UID:$LOGIN_GID" "$ttyname"