For instance, the -f switch commonly used to tell a program to read a configuration file complicates the configuration because the file may override or supplement options given on the command line.
If a previous checkpoint is already in progress, the checkpoint forced by the log switch will override the current checkpoint.
如果先前的检查点已经在进行中，由日志切换引起的检查点会覆盖当期的检查点。
3
The override action occurs when a slight pull toward the driver on the switch lever providers high beam headlights regardless of the amount of light on the sensor-amplifier.