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A Flexible DSL For Processing Logs

Project Description

routelog is a flexible execution-based log processing program and Domain Specific Language. routelog takes a rules file in the following format:

/pattern/    command $1 $2

And operates on one or more log files, executing command $1 $2 for all lines matching the regular expression /pattern/ substituting the first and second items in the log line for $1 and $2 respectively. A rules file with the following directive:

/ERROR/      echo "$*" | mail -s "Error executing ${3%:} on $2 at $1"

Would process a log entry like:

2012-12-07T12:06:11-05:00 server1 program_name: ERROR foo

and send an email to with the subject:

Error executing program_name on server1 at 2012-12-07T12:06:11-05:00'

and the body:

2012-12-07T12:06:11-05:00 server1 program_name: ERROR foo

Rules files are processed by the routelog program:

routelog mail-errors.rules /var/log/*.log

The routelog program acts as a filter, passing all log lines to stdout, which is useful for doing additional processing in a single pipeline:

routelog mail-errors.rules /var/log/*.log | bzip2 > todays-logs.`date +%s`.bz2

For more on rules files, see man 5 routelog, for more on routelog see man 1 routelog.


The routelog project lives on github, and is available via pip.

Installing v0.1 From Pip

sudo pip install routelog==0.1

Installing v0.1 From Source

wget | tar vzxf -
cd routelog-0.1
sudo python install


routelog [-h|--help] [-c|--comments] [-n|--no-output] rules_file [ log_file [...]]

Optional Arguments

-h, –help
Print an extended usage to stdout and exit.
-c, –comments
Treat comments in log lines (anything following a ‘ #’) as arguments, rather than ignoring them.
-n, –no-output
Suppress the (default) behavior of printing each log line to stdout.

More documentation is available via for the routelog program (man 1 routelog) and routelog rules file formats (man 5 routelog) after install.


routelog is made available for use under a 3-clause BSD license (see: LICENSE.txt in the package).


Matthew Story (

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