+#!/bin/sh
+# Hard link files to those in argument-selected subdirectories of
+# linkable_etc_files//, e.g. link /etc/foo/bar to
+# linkable_etc_files/$1/etc/foo/bar and so on. Create directories as
+# necessary. We do the hard linking so files that should be readable to
+# non-root in /etc/ remain so despite having a path below /root/, as
+# symbolic links point into /root/ without making the targets readable
+# to non-root.
+# CAUTION: This removes original files at the affected paths.
+set -e
+
+config_tree_prefix="${HOME}/config/all_new_2018/linkable_etc_files/"
+
+for target in "$@"; do
+ cd "${config_tree_prefix}${target}"
+ for path in $(find . -type f); do
+ linking=$(echo "${path}" | cut -c2-)
+ linked=$(realpath "${path}")
+ dir=$(dirname "${linking}")
+ mkdir -p "${dir}"
+ ln -f "${linked}" "${linking}"
+ done
+done