NAME

       environment.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 ALSO

       systemd(1), systemd-environment-d-generator(8), systemd.environment-generator(7)