实用工具

日志时间戳过滤器

按时间戳过滤和分析日志文件

Log Timestamp Filter

Generate grep, awk, sed commands and regex patterns for timestamp-based log filtering

Command Tool

Timestamp Format

Log File Path

Date Filter (optional)

grep - Pattern Matching - ISO 8601 (2024-01-01T12:00:00)

Basic Timestamp Grep

grep -E "\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}" /var/log/application.log

Find all lines containing timestamps in the specified format

Grep with Line Numbers

grep -nE "\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}" /var/log/application.log

Show line numbers with matching timestamp lines

Grep with Context

grep -A 2 -B 2 -E "\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}" /var/log/application.log

Show 2 lines before and after each match for context

Count Timestamp Occurrences

grep -cE "\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}" /var/log/application.log

Count the number of lines with timestamps

Common Log Filtering Examples:

Real-time monitoring:

tail -f /var/log/application.log | grep -E "pattern"

Error logs only:

grep -i "error\|warn\|fail" /var/log/application.log

Last 100 lines:

tail -n 100 /var/log/application.log

Unique timestamps:

grep -oE "pattern" /var/log/application.log | sort -u

Test commands on a small log file first to verify the pattern matches correctly

Use appropriate file permissions and be careful with large log files