Description of Problem:

I marked this as "all" platforms because at's generic, and this is really 
badly broken.

How Reproducible:

submit a job that relies on any variable in the current environment. 
let's take a real obvious one: PATH.

E.g., I use "#!/usr/bin/env bash" on my scripts so they'll still work on 
Slowlaris, where bash is in /usr/local.

Now let's look at the file that at creates to run the job:

PATH=/home/alane/misc/scripts:/home/alane/bin:/home/alane/sbin:/usr/local/sbin:/usr/local/bin:/usr/local/jre1.2.2/bin:/usr/kerberos/bin:/bin:/usr/bin:/usr/X11R6/bin; 
export PATH=
# <horshack>
# OOH! OOH! THERE IT IS!
# </horshack>
cd /system/software/redhat/rh\-installed || {
         echo 'Execution directory inaccessible' >&2
         exit 1
}



AAAUUUUGGGHH!!! WTF!!!???? Patch13 introduces this bug. Remove the second 
hunk of Patch13. 

diff -u -r at-3.1.8/at.c.env at-3.1.8/at.c
--- at-3.1.8/at.c	Fri May 18 13:09:36 2001
+++ at-3.1.8-eqp/at.c	Fri May 18 12:47:08 2001
@@ -360,7 +360,7 @@
 	char *eqp;
 
 	eqp = strchr(*atenv, '=');
-	if (ap == NULL)
+	if (eqp == NULL)
 	    eqp = *atenv;
 	else {
 	    unsigned int i;
@@ -405,7 +405,7 @@
 		}
 	    }
 	    fputs("; export ", fp);
-	    fwrite(*atenv, sizeof(char), eqp - *atenv - 1, fp);
+	    fwrite(*atenv, sizeof(char), eqp - *atenv, fp);
 	    fputc('\n', fp);
 
 	}

How in hell did this get released?