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-rwxr-xr-xman/50-xdg-data-dirs.sh13
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diff --git a/man/50-xdg-data-dirs.sh b/man/50-xdg-data-dirs.sh
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+#!/bin/sh
+# SPDX-License-Identifier: MIT-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}"