diff --git a/selftest/save.env.sh b/selftest/save.env.sh
new file mode 100755
index 00000000000..9906f95e1ae
--- /dev/null
+++ b/selftest/save.env.sh
@@ -0,0 +1,15 @@
+#!/bin/sh
+
+{
+	vars=`set | \
+		grep "^[a-zA-Z][^=]*='[^']*'$" | \
+		grep -v '^IFS=' | \
+		grep -v '^TERM' | \
+		grep -v '^PPID' | \
+		grep -v '^PS[1-9]=' | \
+		cat `
+	echo "${vars}"
+	echo "${vars}" | sed -e 's!^\([a-zA-Z][^=]*\)=.*$!export \1!'
+} > bin/restore.env.source
+
+echo "RUN: '. bin/restore.env.source'"