Visudo

visudo is a unix command that edits the "sudoers" file in a safe fashion, namely by preventing multiple simultaneous edits with locks, performing sanity checks, and checking for parse errors. The "sudoers" file allows listed users access to execute to a subset of commands while having the privileges of the root user.

for more info see the web pagehttp://www.gratisoft.us/sudo/man/visudo.html

OPTIONS

visudo accepts the following command line options:

-c

Enable check-only mode. The existing sudoers file will be checked for syntax and a message will be printed to the standard output detailing the status of sudoers. If the syntax check completes successfully, visudo will exit with a value of 0. If a syntax error is encountered, visudo will exit with a value of 1.-f

Specify and alternate sudoers file location. With this option visudo will edit (or check) the sudoers file of your choice, instead of the default, /etc/sudoers. The lock file used is the specified sudoers file with ``.tmp" appended to it.-q

Enable quiet mode. In this mode details about syntax errors are not printed. This option is only useful when combined with the -c flag.-s

Enable strict checking of the sudoers file. If an alias is used before it is defined, visudo will consider this a parse error. Note that it is not possible to differentiate between an alias and a hostname or username that consists solely of uppercase letters, digits, and the underscore ('_') character.-V

The -V (version) option causes visudo to print its version number and exit.