$ sudo ls
...
/var/log/auth.log:
sudo: pam_ssh_agent_auth: Beginning pam_ssh_agent_auth for user sergio
sudo: pam_ssh_agent_auth: Attempting authentication: `sergio' as
`sergio' using /etc/ssh/sudo_authorized_keys
sudo: pam_ssh_agent_auth: Contacted ssh-agent of user sergio (1000)
$ /usr/bin/sudo ls
...
/var/log/auth.log:
sudo: pam_ssh_agent_auth: Beginning pam_ssh_agent_auth for user sergio
sudo: pam_ssh_agent_auth: Attempting authentication: `sergio' as
`sergio' using /etc/ssh/sudo_authorized_keys
sudo: pam_ssh_agent_auth: No ssh-agent could be contacted
--
sergio.
