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)

systemd 237                                                                                     ENVIRONMENT.D(5)