  This paper describes the ATLAS production tool AtCom (for ATLAS Commander).
The purpose of the tool is to automate as much as possible the task of a
production manager: defining and submitting jobs in large quantities, following
up upon their execution, scanning log files for known and unknown errors,
updating the various ATLAS bookkeeping databases on successful completion of a
job whilst cleaning up and resubmitting otherwise. The design of AtCom is
modular, separating the generic basic job management functionality from the
interactions with the various databases on the one hand, and the computing
systems on the other hand. Given the near future reality of different flavors
of computing systems (legacy and GRID) deployed concurrently at the various, or
even a single ATLAS site, AtCom allows several of them to be used at the same
time transparently.
