logpattern

Log Pattern Detector - analyzes log files to identify recurring patterns.

Purpose

Parse log files and extract common patterns by normalizing variable content such as numbers, UUIDs, IP addresses, and timestamps.

Installation

go build -o logpattern ./cmd/logpattern

Usage

logpattern <logfile>

Examples

# Analyze application log
logpattern /var/log/app.log

# Analyze error logs
logpattern /var/log/error.log

# Analyze from stdin
cat app.log | logpattern -

Output

=== LOG PATTERN ANALYSIS ===

   15 |  37.50% | Error: Connection to <IP> failed after <NUM> retries
  Samples:
    Error: Connection to 192.168.1.100 failed after 3 retries
    Error: Connection to 192.168.1.101 failed after 2 retries

    8 |  20.00% | User <UUID> logged in successfully
  Samples:
    User a3f5b8c2-d9e1-f4a6-b7c8-d9e0f1a2b3c4 logged in successfully

   5 |  12.50% | Request completed in <NUM>ms

Normalization

The tool normalizes the following patterns:

• Numbers replaced with <NUM>
• UUIDs replaced with <UUID>
• IP addresses replaced with <IP>
• Timestamps replaced with <TIMESTAMP>

Dependencies

• Go 1.21+
• github.com/fatih/color

Build and Run

# Build
go build -o logpattern ./cmd/logpattern

# Run
go run ./cmd/logpattern /path/to/logfile.log

License

MIT