diff -up at-3.1.10/at.c.filter-environment at-3.1.10/at.c

--- at-3.1.10/at.c.filter-environment	2014-10-02 10:21:01.684890331 +0200

+++ at-3.1.10/at.c	2014-10-02 10:21:40.678770635 +0200

@@ -388,6 +388,22 @@ writefile(time_t runtimer, char queue)

 	int export = 1;

 	char *eqp;

+        /* Only accept alphanumerics and underscore in variable names.

+         * Also require the name to not start with a digit.

+         * Some shells don't like other variable names.

+         */

+        {

+            char *p = *atenv;

+            if (isdigit(*p))

+                export = 0;

+            for (; *p != '=' && *p != '\0'; ++p) {

+                if (!isalnum(*p) && *p != '_') {

+                    export = 0;

+                    break;

+                }

+            }

+        }

+

 	eqp = strchr(*atenv, '=');

 	if (ap == NULL)

 	    eqp = *atenv;