systemd/man/50-xdg-data-dirs.sh

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#!/bin/sh
# SPDX-License-Identifier: CC0-1.0
# set the default value
XDG_DATA_DIRS="${XDG_DATA_DIRS:-/usr/local/share/:/usr/share}"
# add a directory if it exists
if [ -d /opt/foo/share ]; then
XDG_DATA_DIRS="/opt/foo/share:${XDG_DATA_DIRS}"
fi
# write our output
echo "XDG_DATA_DIRS=${XDG_DATA_DIRS}"