Let 3.files.sh logs installed files

sdata/lib/functions.sh

@@ -415,3 +415,13 @@ function ensure_cmds(){
     install_cmds "${not_found_cmds[@]}"
   fi
 }
+
+function dedup_and_sort_listfile(){
+  if test -f "$1"; then
+    echo "File not found: $1" >&2; return 2
+  else
+    temp="$(mktemp)"
+    sort -u -- "$1" > "$temp"
+    mv -f -- "$temp" "$2"
+  fi
+}