diff --git a/script/file_manage.sh b/script/file_manage.sh
index 3c6258f..81ca39d 100644
--- a/script/file_manage.sh
+++ b/script/file_manage.sh
@@ -108,7 +108,7 @@ progress_bar(){
 time=$1
 ncheck=$2
 bar_len=$3
-prefix=$4
+prefix=${4:-params}
 N=$5
 slurm=${6:-slurm}