I agree with pvaldes, it seems like you are not using at correctly. In fact, I'm surprised at is not returning an error immediately. I have tried three Unix flavors and get an error when I do not specify a time.
me@myaixbox:/home/me/sandbox
$ at -f 1.pl
at: 0481-110 Command usage error; a parameter is missing.
me@myaixbox:/home/me/sandbox
$ uname
AIX
me@mylinuxbox:~/sandbox
$ at -f 1.pl
Garbled time
me@mylinuxbox:~/sandbox
$ uname
Linux
userid@somebox:/tmp/tmp.66
# at -f 1.pl
bad time specification
userid@somebox:/tmp/tmp.66
# uname
HP-UX
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