To connect to a local Wildfly server via the command line, the tool bin/jboss-cli.sh can be used:

$ ./bin/jboss-cli.sh --connect
[standalone@localhost:9990 /] 

To connect to a remote Wildfly server, use the --controller option:

$ ./bin/jboss-cli.sh  --connect --controller=localhost:9990
[standalone@localhost:9990 /] 

Note that the port 9990 is used for the administrative operations, and as such, should not be opened to the public internet. By default, Wildfly binds the administrative port to localhost, which means that it cannot be accessed from remote hosts. To overcome this, start Wildfly with the -bmanagement option, specifying the IP it should bind to:

$ ./bin/standalone.sh -bmanagement 0.0.0.0