When I run sudo and enter my password, a subsequent invocation of sudo within a few minutes will not need the password to be re-entered.How can I change the default timeout to require the password again?
Change default sudo password timeout
sudo
man sudoers says:Once a user has been authenticated, [...] the user may then use sudo without a password for a short period of time (5 minutes unless       overridden by the timestamp_timeout option). To change the timeout, run, sudo visudo and add the line:Defaults        timestamp_timeout=30where 30 is the new timeout in minutes.To always require a password, set to 0. To set an infinite timeout, set the value to be negative.To totally disable the prompt for a password for user ravi:Defaults:ravi      !authenticate