vc/integer

vc/1
vc/2
vc/3
vc/4
vc/5
vc/6
vc/7
vc/8
vc/9
vc/10
vc/11



grep -E 'vc/(d{0,4}D)*' /etc/securetty | while read line; do sed -ie "s=$line==g" /etc/securetty; done

0
1

sed -i -e 's|vc/[0-9]{1,}||g' /etc/security