diff --git a/cd.sh b/cd.sh
index fa39bf9..23c74a8 100644
--- a/cd.sh
+++ b/cd.sh
@@ -286,6 +286,15 @@ cd_cat () {
     fi
 }
 
+cd_error_ci () {
+    echo "× CI: ${1}"
+    exit 1
+}
+cd_error_os () {
+    echo "× OS: ${1}"
+    exit 2
+}
+
 cd_install_package () {
     if [ "${1}" ] ; then
         case "${CD_OS_NAME}" in