Fix macOS "System Logs" Taking Up Space

Are hidden log files consuming tens of gigabytes on your Mac?

Recommended Troubleshooting Tool

Before proceeding with manual fixes, we recommend using CleanMyMac X. The gold standard for identifying hidden System Data bloat and runaway log files.

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The Symptom

Your storage is full, and tools show that /var/log or /private/var/db/diagnostics is massive.

The Fix

1. The Terminal Log Flush

Open Terminal and clear the system log databases:

sudo log erase --all

1. Delete ASL Logs

sudo rm -rf /var/log/asl/*.asl

1. Disable Verbose Logging

If you recently ran a beta or diagnostic tool, ensure you've turned off verbose mode, which can generate gigabytes of text files in minutes.

Fix 3: The Automated Log Purge

When system processes are "chatty" and generating logs faster than you can delete them.

Recommended Tool: CleanMyMac X

- System Junk: Automatically identifies and removes system logs, user logs, and crash reports that are safe to delete.

- Maintenance: Rotates and compresses logs to ensure they don't grow out of control in the future.

[Link: Purge System Logs with CleanMyMac X]