diff -ur ratpoison.orig/src/actions.c ratpoison/src/actions.c
--- ratpoison.orig/src/actions.c	Thu Sep 13 21:14:29 2001
+++ ratpoison/src/actions.c	Fri Sep 14 20:11:30 2001
@@ -66,6 +66,7 @@
     {"vsplit",		cmd_v_split,	arg_VOID},
     {"windows", 	cmd_windows, 	arg_VOID},
     {"setenv",		cmd_setenv,	arg_STRING},
+    {"unsetenv",	cmd_unsetenv,	arg_STRING},
 
     /* Commands to set default behavior. */
     {"defbarloc",	cmd_defbarloc, 		arg_STRING},
@@ -1792,5 +1793,30 @@
 
   free (var);
   free (string);
+  return NULL;
+}
+
+char *
+cmd_unsetenv (int interactive, void *data)
+{
+  char *var;
+
+  if (data == NULL)
+    {
+      message (" unsetenv: One argument required ");
+      return NULL;
+    }
+
+  var = xmalloc (strlen (data) + 1);
+  if (sscanf (data, "%s", var) < 1)
+    {
+      message (" unsetenv: One argument required ");
+      free (var);
+      return NULL;
+    }
+
+  unsetenv (var);
+
+  free (var);
   return NULL;
 }
diff -ur ratpoison.orig/src/actions.h ratpoison/src/actions.h
--- ratpoison.orig/src/actions.h	Thu Sep 13 21:14:29 2001
+++ ratpoison/src/actions.h	Fri Sep 14 19:10:26 2001
@@ -91,6 +91,7 @@
 char * cmd_deffgcolor (int interactive, void *data);
 char * cmd_defbgcolor (int interactive, void *data);
 char * cmd_setenv (int interactive, void *data);
+char * cmd_unsetenv (int interactive, void *data);
 
 /* void cmd_xterm (void *data); */