Parse input lines using custom patterns and output more readable and helpful lines.

Install

npm install -g linecat

Usage

• linecat -p=pattern_path

pattern_path is the custom pattern json file. Example patterns json files are listed in src/example-patterns.

Pattern json file

| field | require | note | | ------------ | ------- | -------------------------------------------------------------------------- | | id | no | the id of current pattern, which can be referenced in outputFormat field | | line | no | regular expression for whole line content | | outputFormat | no | specific output line format. Available env variables are listed below. |

Many env variables are available in outputFormat field:

| Env var name | note | | ---------------------- | ----------------------------------------------------------------------------------------------- | | id | current pattern id | | line | whole line | | content | whole line except other tokens | | level | log level if available | | month | month of current line if available | | day | date of current line if available | | hours | hours of current line if available | | minutes | minute of current line if available | | seconds | seconds of current line if available | | ms | ms of current line if avaiilable | | timediff | time diff from current line. | | last-[id|line]-{...} | last matched line of specific id or any matched line for fields above. eg: last-line-timediff |

You can also check example patterns in src/example-patterns to know more usage.