1 files changed, 11 insertions, 3 deletions
diff --git a/main.c b/main.c
index 8567596..00294cf 100644
--- a/main.c
+++ b/main.c
@@ -27,7 +27,7 @@ const char* skip_blank(const char **c){
 
 int get_addr(const char **cmd){
 
-  int addr, n, got;
+  int addr, n, got, d;
   char sign = 1, comma = 0, semic = 0, DIR = FW;
   const char *c;
   line_t *p;
@@ -86,6 +86,11 @@ int get_addr(const char **cmd){
       case '\'': /* mark */
         fprintf(stderr, "    >>>> address is a mark!!!\n");
         c++;
+        d = *c - 'a';
+        if (d < 0 || d > 26){
+          E;
+          return -1;
+        }
         p = marks[*c - 'a'];
         if (!p)
           E;
@@ -347,7 +352,10 @@ void main_loop(){
       break;
     case '!':
       cmd += 1;
-      //exec_command();
+      system(cmd);
+      printf("!\n");
+      /* exec_command(cmd, stdout); */
+      break;
     case '=':
       if (addr1 == -1)
         addr1 = num;
@@ -385,7 +393,7 @@ int main(int argc, char *argv[]){
   }
   main_loop();
   addr1 = num, addr2 = 1;
-  delete_lines();
+  if (num>0) delete_lines();
   free(fname);
 }