Adding and Deleting subdomains with Plesk on the Command Line

Plesk has the disadvantage that everything is done through the
database. So we can't just modify Bind's Zone files.

To add an A record of a subdomain you have to do the following:

/usr/local/psa/bin/dns -a domain.tld -a subdomain -ip 127.0.0.1

the first -a is for add to zone which is why it must specify the top
level domen, the second is for A record, and must not contain the full
domain only the subdomain. If you use the full domain
subdomain.domain.tld you will end up with a record like
subdomain.domain.tld.domain.tld because plesk does not allow you to
terminate with a .. Thank you plesk for a shitty interface. The record
this create's looks like

subdomain.domain.tld. IN A 127.0.0.1

To delete this record you would use the following

/usr/local/psa/bin/dns -d domain.tld -a subdomain -ip 127.0.0.1

you'll note that it's the exact same thing except you replace the
first -a which is for add, with -d for delete.

Adding a new group to an open shell without logging in and out

Most Unix users believe it's impossible to add a group that was recently added to your user account without logging in and logging out. If you're running X and need to give your gui new permissions (like dolphin/konqueoror) this may be true, for the most part. I don't know how to change it for those processes. However, if you need to change it for a shell prompt it's easy. You merely execute the command newgrp in an open shell prompt and that prompt will now be loaded with the new group. I believe it also changes the default group that shell is running as. So if you run newgrp http; touch test.txt your file will be created with the group http instead of whatever your default is. You can change your group back to the default by using the sg command.