You can also edit your /etc/sudoers file and add this line to turn off the sudo grace period:

Defaults:ALL timestamp_timeout=0

You'll need to use the "sudo visudo" command to do this. There are a few other things you can do to tighten down the sudo command, such as enabling logging and restricting which users can use it, so interested users may find it useful to also do a "man sudoers" and read about the various options.

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