clogl - Linux
Overview
clogl is a command-line tool for generating log files in a simple, structured, and human-readable format. It provides a flexible way to capture, filter, and output log data, making it useful for debugging, monitoring, and analyzing applications.
Syntax
clogl [OPTIONS] [FILTERS]
OPTIONS
-f
,--file
: Output to the specified file-l
,--level
: Set the minimum log level to output-s
,--stdout
: Output to the standard output-h
,--help
: Display usage information
FILTERS
Filters specify which log messages to output. Multiple filters can be combined using logical operators.
Logical Operators
&&
: AND||
: OR!
: NOT
Message Properties
level
: Log level (e.g.,info
,error
)source
: Log source (e.g., package, class)text
: Log message text
Comparison Operators
=
: Equals!=
: Not equals>
,<
,>=
,<=
: Numeric comparisons
Examples:
level >= error
source = "my_package"
text contains "keyword"
Options/Flags
-f
, --file
Specifies the file to output log messages to. If the file does not exist, it will be created.
-l
, --level
Sets the minimum log level to output. Messages with a level lower than the specified level will be filtered out.
-s
, --stdout
Outputs log messages to the standard output instead of a file.
-h
, --help
Displays usage information.
Examples
Output the last 100 log messages to a file:
clogl -f /var/log/my_app.log -l debug
Filter log messages for a specific source and level:
clogl source = "my_app" level >= error
Output log messages to the standard output and filter by text:
clogl -s text contains "my_keyword"
Common Issues
Missing log file:
If you specify an invalid file path for output, clogl will fail with an error.
Invalid filter syntax:
Check for syntax errors in your filter expressions. Ensure that operators and property names are spelled correctly.
Integration
Log rotation:
clogl can be integrated with log rotation tools to automatically manage log files.
External data sources:
clogl can read log messages from external data sources such as syslog or a database by implementing a custom log reader.
Related Commands
- logger: Sends log messages to syslog
- syslog-ng: A powerful syslog daemon
- grep: Filters text for patterns
- sed: Performs text transformations