Linux Command Library


Run an system and security audit on the system

lynis --check-all(-c) [other options]

Lynis is an auditing tool for Unix (specialists). It checks the system and software configuration and logs all the found information into a log file for debugging purposes, and in a report file suitable to create fancy looking auditing reports. Lynis can be run as a cronjob, or from the command line. It needs to have full access to the system, so running it as root (or with sudo rights) is required.

The following system areas may be checked:

- Boot loader files

- Configuration files

- Common files by software packages

- Directories and files related to logging and auditing

--auditor <full name>

Define the name of the auditor/pen-tester. When a full name is used, add double quotes, like "Michael Boelen".

--checkall (or -c)

Lynis performs a full check of the system, printing out the results of each test to stdout. Additional information will be saved into a log file (default is /var/log/lynis.log).

In case the outcome of a scan needs to be automated, use the report file.

--check-update (or --info)

Show program, database and update information


Perform automatic scan with cron safe options (no colors, no questions, no breaks).

--logfile </path/to/logfile>

Defines location and name of log file, instead of default /var/log/lynis.log.


Do not use colors for messages, warnings and sections.


Redirect all logging information to /dev/null, prevent sensitive information to be written to disk.

--quick (-Q)

Do a quick scan (don’t wait for user input)

--quiet (-q)

Try to run as silent as possible, showing only warnings. This option activates --quick as well.


Optimize screen output for light backgrounds.

--tests TEST-IDs

Only run the specific test(s). When using multiple tests, add quotes around the line.


Display all available test categories

Multiple parameters are allowed, though some parameters can only be used together with others. When running Lynis without any parameters, help will be shown and the program will exit.

There are no known bugs. Bugs can be reported directly to author.

Lynis is licensed under the GPL v3 license and under development by Michael Boelen.

Project related questions and comments should be asked via

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