>If **-t**, **-o**, and **-n** are specified, the system checks whether the configured event tag is null. If the event tag is not null, the system filters system events based on the matching rules for the event tag. Otherwise, the system filters system events based on the matching rules for the event domain and event name.
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@@ -89,6 +118,16 @@ The HiSysEvent tool is a command line tool preconfigured in the **/system/bin**
| -s | Start time for querying historical system events. Only system events generated after the start time are returned.|
| -e | End time for querying historical system events. Only system events generated before the end time are returned.|
- Command for setting the maximum number of historical events that can be queried:
```
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@@ -100,3 +139,16 @@ The HiSysEvent tool is a command line tool preconfigured in the **/system/bin**
| Option| Description|
| -------- | --------- |
| -m | Maximum number of historical system events that can be queried. The value ranges from **0** to **1000**. The number of returned system events is not more than the value of this parameter.|