fix bug in linux for loading codec param from cfg file

@@ -28,7 +28,7 @@ vector<fileinfo>  media_files[2];
 void run_shell_cmd(const char * cmd)
 {
 	if (only_print){
-		printf("\n%s", cmd);
+		printf("%s\n", cmd);
 	}
 	else {
 		system(cmd);
@@ -247,7 +247,8 @@ void load_codec_param()
 	GetExePath();
 	strcpy(cfgfile, exe_path);
 #else
-	strcpy(cfgfile , "~/";
+	strcpy(cfgfile ,getenv("HOME"));
+	strcat(cfgfile ,"/");
 #endif
 	strcat(cfgfile, "merge_av.cfg");
 	ifstream fin(cfgfile);