Private Data and the log Utility

Episode #345 | 6 minutes | published on July 6, 2018 | Uses Xcode-10.0-beta2

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logging

In this episode we talk about public versus private data (and how to change the defaults). We also look at using the log command line tool for a deeper understanding of the unified logging system and how we can tweak it for our needs.

This episode is part of a series: Unified Logging and Activity Tracing.

1. Introduction to the Unified Logging Framework 10 min

2. Using os_log to Log Messages 12 min

3. Private Data and the log Utility 6 min

4. Streaming Logs with the log Tool 5 min

5. Activity Tracing in Swift 20 min

6. Using Signposts to Diagnose Performance Issues 26 min

Using the log Utility to Set Log Levels

Check the status of the logging system:

sudo log config --status

Set the log level to debug:

sudo log config --mode "level:debug"

Tell the system to persist info messages to disk, and show debug messages, only for our subsystem:

sudo log config --mode "level:debug,persist:info" --subsystem com.ficklebits.UnifiedLoggingDemo

Turn on (or off) private data:

sudo log config --mode "private_data:on"

Reset settings back to the default:

sudo log config --reset

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Private Data and the log Utility

Private Data and the log Utility

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Using the log Utility to Set Log Levels