For library documentation, see the module documentation.
Logdissect is a CLI utility and Python library for analyzing log files and other data. It can parse, merge, filter, and export data (to log files, or JSON).
To install the latest release, see the latest instructions on the releases page. To install the development source, see the instructions in CONTRIBUTING.md.
usage: logdissect.py [-h] [--dhost DHOST] [--grep PATTERN] [--last LAST]
[--process PROCESS] [--protocol PROTOCOL] [--range RANGE]
[--utc] [--rdhost DHOST] [--rgrep PATTERN]
[--rprocess PROCESS] [--rprotocol PROTOCOL]
[--rshost SHOST] [--rsource SOURCE] [--shost SHOST]
[--source SOURCE] [--linejson LINEJSON] [--outlog OUTLOG]
[--label LABEL] [--sojson SOJSON] [--pretty] [--version]
[--verbose] [-s] [--list-parsers] [-p PARSER] [-z]
[-t TZONE]
[file [file ...]]
positional arguments:
file specify input files
optional arguments:
-h, --help show this help message and exit
--version show program's version number and exit
--verbose set verbose terminal output
-s silence terminal output
--list-parsers return a list of available parsers
-p PARSER select a parser (default: syslog)
-z, --unzip include files compressed with gzip
-t TZONE specify timezone offset to UTC (e.g. '+0500')
filter options:
--dhost DHOST match a destination host
--grep PATTERN match a pattern
--last LAST match a preceeding time period (e.g. 5m/3h/2d/etc)
--process PROCESS match a source process
--protocol PROTOCOL match a protocol
--range RANGE match a time range (YYYYMMDDhhmm-YYYYMMDDhhmm)
--utc use UTC for range matching
--rdhost DHOST filter out a destination host
--rgrep PATTERN filter out a pattern
--rprocess PROCESS filter out a source process
--rprotocol PROTOCOL filter out a protocol
--rshost SHOST filter out a source host
--rsource SOURCE filter out a log source
--shost SHOST match a source host
--source SOURCE match a log source
output options:
--linejson LINEJSON set the output file for line by line JSON output
--outlog OUTLOG set the output file for standard log output
--label LABEL set label type for OUTLOG (fname|fpath)
--sojson SOJSON set the output file for single object JSON output
--pretty use pretty formatting for sojson output
Output of --list-parsers option:
==== Available parsing modules: ====
ciscoios : cisco ios parsing module
emerge : gentoo emerge log parsing module
linejson : logdissect object-per-line JSON parsing module
sojson : logdissect single object JSON parsing module
syslog : syslog (standard timestamp) parsing module
syslogiso : syslog (ISO timestamp) parsing module
syslognohost : syslog (standard timestamp, no host) parsing module
tcpdump : tcpdump terminal output parsing module
webaccess : web access log parsing module
windowsrsyslog : windows rsyslog agent log parsing module
logdissect --last 10m auth.log
logdissect --last 1h --process systemd --process CRON messages
logdissect -v --range 20160202020202-20170227213200 --label fpath messages debug apache2/error.log
logdissect -s --outlog myaccess.log --grep 192.168.1.56 --last 30d --label fname /var/log/apache2/access.log /var/log/apache2/other_vhosts_access.log
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metadata: logdissect uses file modification times to assign years to syslog date stamps. This allows it to parse logs that span more than one year without a problem. If you are copying log files, always use
cp -p(orcp --preserve=timestamps) andscp -pto preserve original mtimes and other file metadata. -
Re-parsing: If you are planning on parsing an output file back into logdissect at some point, using JSON is highly recommended. The JSON output modules use date stamps that include a year. Re-parsing a standard log output file will cause problems if the file has a different mtime than the original logs.
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--range shortcuts: The range module will fill in your ranges with zeroes if they are shorter than 14 characters. If you want to get a range of 20170204120000 to 20170204130000, you can save time and use 2017020412 and 2017020413.
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--last options: The last option should be a number followed by either 's' for seconds, 'm' for minutes, 'h' for hours, or 'd' for days (e.g. --last=20m).
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Multiple options: All non-time-based filters can be used more than once.
logdissect 2.0 and above provides a stable module for parsing log lines and files. For more information on library usage, see the module documentation.
Bugs, questions, and other issues can be directed to the project's issues page on GitHub, or emailed to [email protected].
Contributions are welcome in the form of code, bug fixes, or testing feedback. For more on how to contribute to logdissect, see the code of conduct and contributing guielines.
MIT License
Copyright (c) 2017 Dan Persons ([email protected])
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.