修复 shell 未定义变量错误

shell/share.sh

@@ -451,9 +451,9 @@ handle_task_start() {
 run_task_before() {
   . $file_task_before "$@"
 
-  if [[ $task_before ]]; then
+  if [[ ${task_before:=} ]]; then
     echo -e "执行前置命令\n"
-    eval "$task_before" "$@"
+    eval "${task_before%;}" "$@"
     echo -e "\n执行前置命令结束\n"
   fi
 }
@@ -463,7 +463,7 @@ run_task_after() {
 
   if [[ ${task_after:=} ]]; then
     echo -e "\n执行后置命令\n"
-    eval "$task_after" "$@"
+    eval "${task_after%;}" "$@"
     echo -e "\n执行后置命令结束"
   fi
 }