How To Use 'Sudo' And 'Su' Commands In Linux : An Introduction?

The real and effective group IDs, however, are still set to match the target user.

[SOLVED] Sudo in shell script

By default, without any other command line argument, this will elevate the current user to the root user of the local system. Find More Posts by clvic. The timeout on sudo is configurable.

Having a problem logging in? It is most useful in conjunction with the -s flag. If the invoking user is root or if the target user is the same as the invoking user, no password is required.

Information self. You can also subscribe without commenting. Note that the mail will not be sent if an unauthorized user tries to run sudo with the -l or -v flags. Matching Defaults entries for john on server1: The -p prompt option allows you to override the default password prompt and use a custom one. To protect the computer and the privacy of other users , the users' abilities are restricted. By default, this is the user's password, not the root password itself.

To edit the sudoers file, use the visudo command. February 11, October 31, at 1: You could have used the sudoedit command, which is simply a shortcut for sudo -e. Would you like to answer one of these unanswered questions instead?

Please stop. By default sudo will log via syslog 3 but this is changeable at configure time or via the sudoers file. If the timeout expires before the command has exited, the command will be terminated.

Join the discussion. For example, the below will safely pipe your password to the sudo command, without retaining a history of your password. The -S stdin option causes sudo to read the password from standard input instead of the terminal device.

By default, sudo does not modify HOME. Dec Location: BUGS If you feel you have found a bug in sudo , please submit a bug report at https: This is unlikely to happen since once the timestamp dir is owned by root and inaccessible by any other user the user placing files there would be unable to get them back out.

Security-conscious people aka paranoid, like me set it to zero Aaron Kili is a Linux and F. The downside to the above method is that if you want to see the commands you ran in the history later on they won't be there.

Got something to say? If a user runs a command such as " sudo su " or " sudo sh ", subsequent commands run from that shell will not be logged, nor will sudo 's access control affect them.

Linux sudo command

The main sudo process waits until the command has completed, then passes the command's exit status to the security policy's close function and exits. BB code is On. If no sudo.