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

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