>JCL == Java Control Language?

the Job Control Language for System/360

if you follow the link i gave you'll see more.

bundles are implemented by here documents,
and the end marker for the document must not appear
in the data, and IBM JCL syntax (even if it were strictly correct)
was unlikely to appear on Unix systems
but would still have a cheery familiarity to some.
the elaborate DD statement defines file associations for a job and
can manipulate permanent files (commonly used with IEFBR14)