A simple CLI tool to scan log files and count occurrences of specific keywords.

This tool helps analyze log files by searching for and counting occurrences of specified keywords. It's particularly useful for quickly identifying error patterns, warning frequencies, or other important events in large log files.

• Keyword Search: Search for multiple keywords in a single scan
• Case Sensitivity: Optional case-sensitive or case-insensitive matching
• Line Numbers: Display line numbers where keywords appear
• Multiple Formats: Works with any text-based log format
• Performance: Efficiently handles large log files

No installation required! Just ensure you have Python 3.6+ installed.

# Clone the repository
git clone https://github.com/sumanth-0/100LinesOfPythonCode.git
cd 100LinesOfPythonCode/#1010_Tiny_Log_Analyzer

python log_analyzer.py <log_file> <keyword1> [keyword2] ...

Search for ERROR and WARNING in a log file:

python log_analyzer.py server.log ERROR WARNING

Case-sensitive search:

python log_analyzer.py app.log -c Error Warning

Show line numbers where keywords appear:

python log_analyzer.py system.log -l ERROR CRITICAL

Combine options:

python log_analyzer.py debug.log -c -l Exception Traceback

• logfile: Path to the log file to analyze (required)
• keywords: One or more keywords to search for (required)
• -c, --case-sensitive: Make keyword matching case-sensitive (default: case-insensitive)
• -l, --lines: Show line numbers where keywords appear
• -h, --help: Show help message

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LOG ANALYSIS RESULTS
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ERROR: 45 occurrences
  Lines: 12, 34, 56, 78, 90, 123, 145, 167, 189, 201 ... (35 more)
WARNING: 23 occurrences
  Lines: 5, 15, 25, 35, 45, 55, 65, 75, 85, 95 ... (13 more)
INFO: 567 occurrences

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Total matches: 635
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1. Opens and reads the specified log file
2. Scans each line for the specified keywords
3. Counts occurrences (including multiple occurrences per line)
4. Optionally tracks line numbers where keywords appear
5. Displays results sorted by frequency

• Python 3.6 or higher
• No external dependencies (uses only standard library)

Contributions are welcome! Please feel free to submit a Pull Request.

This project is part of the 100LinesOfPythonCode repository.

Created for Issue #1010 - Tiny Log Analyzer

Fixes #1010