That's slightly different than the controlling terminal. The
controlling terminal (in UNIX) is the terminal the job is
associated with for signals, but not necessarily the terminal
the job is connected to. For example, running a command
pipeline or redirected command from the shell will make the
process not have a terminal connected to it, but it will still have a controlling terminal. A cron job will have neither a
connected terminal or a controlling terminal. The
difference is subtle but can be important for things like daemons.
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