To configure a Linux or Unix DNS resolver to append domain search names and paths, you can modify the ndots option in the /etc/resolv.conf file.
The ndots option specifies the number of dots that must appear in a domain name before the resolver will try to append domain search names and paths. For example, if the ndots value is set to 1, the resolver will try to append search names and paths to domain names that contain a single dot, such as example.com.
To set the ndots option, you can add a line like the following to the /etc/resolv.conf file:
options ndots:1
This will set the ndots value to 1, so the resolver will try to append search names and paths to domain names that contain a single dot.
It's important to note that the ndots option may be overridden by other settings in the /etc/resolv.conf file or by settings in other configuration files.
For more information about the ndots option and other options that can be used in the /etc/resolv.conf file, you can refer to the resolv.conf manual page or use the --help option. For example:
man resolv.conf
resolv.conf --help
It's also important to note that you may need to restart your network services or reboot your system for the changes to take effect.