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#!/bin/bash
# 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}"
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