systemd-delta Man page



systemd-delta – Find overridden configuration files


systemd-delta [OPTIONS…] [PREFIX[/SUFFIX]|SUFFIX…]


systemd-delta may be used to identify and compare configuration files
that override other configuration files. Files in /etc have highest
priority, files in /run have the second highest priority, …, files in
/lib have lowest priority. Files in a directory with higher priority
override files with the same name in directories of lower priority. In
addition, certain configuration files can have “.d” directories which
contain “drop-in” files with configuration snippets which augment the
main configuration file. “Drop-in” files can be overridden in the same
way by placing files with the same name in a directory of higher
priority (except that, in case of “drop-in” files, both the “drop-in”
file name and the name of the containing directory, which corresponds
to the name of the main configuration file, must match). For a fuller
explanation, see systemd.unit(5).

The command line argument will be split into a prefix and a suffix.
Either is optional. The prefix must be one of the directories
containing configuration files (/etc, /run, /lib, …). If it is given,
only overriding files contained in this directory will be shown.
Otherwise, all overriding files will be shown. The suffix must be a
name of a subdirectory containing configuration files like tmpfiles.d,
sysctl.d or systemd/system. If it is given, only configuration files in
this subdirectory (across all configuration paths) will be analyzed.
Otherwise, all configuration files will be analyzed. If the command
line argument is not given at all, all configuration files will be
analyzed. See below for some examples.


The following options are understood:

-t, –type=
When listing the differences, only list those that are asked for.
The list itself is a comma-separated list of desired difference

Recognized types are:

Show masked files

Show overridden files that while overridden, do not differ in

Show files that are redirected to another.

Show overridden, and changed files.

Show *.conf files in drop-in directories for units.

Show unmodified files too.

When showing modified files, when a file is overridden show a diff
as well. This option takes a boolean argument. If omitted, it
defaults to true.

-h, –help
Print a short help text and exit.

Print a short version string and exit.

Do not pipe output into a pager.

To see all local configuration:


To see all runtime configuration:

systemd-delta /run

To see all system unit configuration changes:

systemd-delta systemd/system

To see all runtime “drop-in” changes for system units:

systemd-delta –type=extended /run/systemd/system

On success, 0 is returned, a non-zero failure code otherwise.


systemd, systemd.unit(5)

systemd 229 SYSTEMD-DELTA(1)