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早期freebsd实现

PATH=/sbin:/usr/sbin:/bin:/usr/bin
export PATH

BLOCKSIZE=1k
export BLOCKSIZE

#export TERM for single user shells.
export TERM

echo 'erase ^H, kill ^U, intr ^C status ^T'
stty erase '^H' kill '^U' intr '^C' status '^T' crt

umask 022

echo "Don't login as root, use the su command."