sudo command examples

– It is a very useful tool to give the role based access to the users.

– Using sudo we can become other user for complete new session or we can get access to commands which are not generally accessed.

– We can give access to files for certain users.

– To list the present sudo status for the user

# sudo -l

# sudo -U santosh -l (for specific user)

– To long list the output

# sudo –U santosh -ll

– To remove users cached credentials

# sudo -k

– To get a file listing of an unreadable directory:

# sudo ls /usr/local/protected

– To view system logs only accessible to root and users in the adm group:

# sudo -g adm view /var/log/syslog

– To shut down a machine:

# sudo shutdown -r +15 “quick reboot”

– To run the command in background

# sudo -b mount /dev/cdrom /DVD

– To run the command as another user

# sudo –u oracle /xyz/abc.sh

– To execute the given command by setting the primary group to the given group

# sudo –g DBA /xyz/abc.sh

– To validate the user credentials

# sudo –v (updates his cached credentials, like if password has been changed)