Error entering interactive mode

[Ryan J Ollos]

$ ./traccmd.py shell rjollos
Password: 
Traceback (most recent call last):
  File "./traccmd.py", line 690, in <module>
    ret = cmdproc.onecmd(a)
  File "./traccmd.py", line 541, in onecmd
    return func(args[1:])
  File "./traccmd.py", line 616, in do_shell
    shell(*arg, **kwargs)
  File "./traccmd.py", line 181, in shell
    os.execl(os.environ["SHELL"])
  File "/Users/rjollos/Documents/Workspace/trac-dev/pve/bin/../lib/python2.7/os.py", line 314, in execl
    execv(file, args)
ValueError: execv() arg 2 must not be empty