clogf - Linux


clogf is a utility designed for logged file analysis. It efficiently extracts specific fields from recorded data, particularly system log files, to deliver pertinent information in a structured, comprehensible format. This tool empowers users with enhanced visibility into their logs, facilitating detailed analysis and streamlining troubleshooting processes.


clogf [-t <time format>] [-f <filter>] <pattern>


  • -t: Specify the time format used in the log file. Example: -t '%Y-%m-%dT%H:%M:%S'
  • -f: Filter the logs based on a specific expression. Example: -f 'error'


Basic Log Extraction

clogf '%H:%M:%S | ERROR | process A' /var/log/system.log

Extraction with Time Format

clogf -t '%m/%d/%Y %H:%M:%S' '%H:%M:%S | ERROR | process A' /var/log/system.log

Log Filtering

clogf -f 'INFO' '%H:%M:%S | %L | process A' /var/log/system.log

Common Issues

Malformed Time Formats

Ensure the time format provided with -t aligns with the actual log file format.

Missing Log File

Verify that the specified log file path is accurate and the file exists.


clogf can be integrated with other tools for advanced analysis:

  • grep: Combine the results of clogf with grep for more precise filtering.
  • awk: Use awk to perform field-specific operations on the extracted data.
  • sed: Employ sed for advanced text manipulation and formatting.

Related Commands

  • grep: A powerful search tool for filtering and extracting text.
  • awk: A versatile command-line utility for pattern matching and data manipulation.
  • sed: A stream editor for text transformation and substitution.