diff --git a/src/script.sh b/src/script.sh
index 9a2dbb1..22d5567 100644
--- a/src/script.sh
+++ b/src/script.sh
@@ -2,9 +2,19 @@
 
 #!/bin/sh
 
-# works best on busybox ash
+# dash does not support pipefail
+# this does not work in `dash script.sh`
+IS_DASH=$(readlink -f "/bin/sh" | grep "dash" || [ $? = 1 ])
+if [ -n "$IS_DASH" ]; then
+  set -efx
+else
+  set -efx -o pipefail
+fi
 
-set -efux -o pipefail
+# bash does not expand alias by default for non-interactive script
+if [ -n "$BASH_VERSION" ]; then
+  shopt -s expand_aliases
+fi
 
 alias cp="cp -f"
 alias curl="curl -L"