ENVIRONMENT.D(5)environment.dENVIRONMENT.D(5)NAMEenvironment.d - Definition of user session environment
SYNOPSIS
~/.config/environment.d/*.conf
/etc/environment.d/*.conf
/run/environment.d/*.conf
/usr/lib/environment.d/*.conf
/etc/environment
DESCRIPTION
The environment.d directories contain a list of "global" environment
variable assignments for the user environment. systemd-environment-d-
generator(8) parses them and updates the environment exported by the
systemd user instance to the services it starts.
It is recommended to use numerical prefixes for file names to simplify
ordering.
For backwards compatibility, a symlink to /etc/environment is
installed, so this file is also parsed.
CONFIGURATION DIRECTORIES AND PRECEDENCE
Configuration files are read from directories in /etc/, /run/, and
/lib/, in order of precedence. Each configuration file in these
configuration directories shall be named in the style of filename.conf.
Files in /etc/ override files with the same name in /run/ and /lib/.
Files in /run/ override files with the same name in /lib/.
Packages should install their configuration files in /lib/. Files in
/etc/ are reserved for the local administrator, who may use this logic
to override the configuration files installed by vendor packages. All
configuration files are sorted by their filename in lexicographic
order, regardless of which of the directories they reside in. If
multiple files specify the same option, the entry in the file with the
lexicographically latest name will take precedence. It is recommended
to prefix all filenames with a two-digit number and a dash, to simplify
the ordering of the files.
If the administrator wants to disable a configuration file supplied by
the vendor, the recommended way is to place a symlink to /dev/null in
the configuration directory in /etc/, with the same filename as the
vendor configuration file. If the vendor configuration file is included
in the initrd image, the image has to be regenerated.
CONFIGURATION FORMAT
The configuration files contain a list of "KEY=VALUE" environment
variable assignments, separated by newlines. The right hand side of
these assignments may reference previously defined environment
variables, using the "${OTHER_KEY}" and "$OTHER_KEY" format. It is also
possible to use "${FOO:-DEFAULT_VALUE}" to expand in the same way as
"${FOO}" unless the expansion would be empty, in which case it expands
to DEFAULT_VALUE, and use "${FOO:+ALTERNATE_VALUE}" to expand to
ALTERNATE_VALUE as long as "${FOO}" would have expanded to a non-empty
value. No other elements of shell syntax are supported.
Each KEY must be a valid variable name. Empty lines and lines beginning
with the comment character "#" are ignored.
Example
Example 1. Setup environment to allow access to a program installed in
/opt/foo
/etc/environment.d/60-foo.conf:
FOO_DEBUG=force-software-gl,log-verbose
PATH=/opt/foo/bin:$PATH
LD_LIBRARY_PATH=/opt/foo/lib${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}
XDG_DATA_DIRS=/opt/foo/share:${XDG_DATA_DIRS:-/usr/local/share/:/usr/share/}
SEE ALSOsystemd(1), systemd-environment-d-generator(8), systemd.environment-
generator(7)systemd 236ENVIRONMENT.D(5)
