Redirect Output of Cron Task to File (both stdout and stderr)

After several failed attempts, I finally figured out how to redirect both stdout and stderr to append to the same file:

do_task >> cron.log 2>&1

One of the previous tries was, do_task &> cron.log but this blew away the log file every time instead of appending.

I always forget how to do this, so I figured I’d blog it both for my future reference or for the reference of anyone else who also always forgets how to do this.