added a script for checking for duplicated refdess
diff --git a/bbb_cape/schematic/check_refdes.sh b/bbb_cape/schematic/check_refdes.sh
new file mode 100755
index 0000000..1ebede1
--- /dev/null
+++ b/bbb_cape/schematic/check_refdes.sh
@@ -0,0 +1,15 @@
+#!/bin/bash
+
+if [[ $# -lt 1 ]]; then
+ find $(dirname $0) \( -name '*.sch' -or -name '*.sym' \) -exec $0 {} \;
+ exit $?
+fi
+
+FILE=$1
+
+DUPLICATED=$(grep -F 'refdes=' "${FILE}" | sort | uniq -d)
+
+if [[ -n ${DUPLICATED} ]]; then
+ echo Duplicated lines in ${FILE}:
+ echo ${DUPLICATED}
+fi