Linux 禁用 Ctrl-Alt-Del
禁用ctrl-alt-delete,为了防止和其他键盘冲突或误关机，可取消快捷键ctrl+alt+del
RHEL 5.X & CentOS 5.X
注释掉 ca::ctrlaltdel
# cat /etc/inittab
# Trap CTRL-ALT-DELETE
#ca::ctrlaltdel:/sbin/shutdown -t3 -r now
修改为：
# cat /etc/inittab
# Trap CTRL-ALT-DELETE
ca::ctrlaltdel:/bin/logger -p authpriv.warning -t init "Console-invoked Ctrl-Alt-Del was ignored"
RHEL6.X & CentOS 6.X
# cp -v /etc/init/control-alt-delete.conf{,.bak}
替换行exec /sbin/shutdown
# cat /etc/init/control-alt-delete.conf
exec /usr/bin/logger -p authpriv.notice -t init "Ctrl-Alt-Del was pressed and ignored"
RHEL 7 / CentOS 7 / RHEL 8 / CentOS 8
# ln -sf /dev/null /etc/systemd/system/ctrl-alt-del.target
或
# systemctl mask ctrl-alt-del.target
