After installing perforce and setup your workspace through p4v, you could set up your workspace in Windows cmd.
The command you need is:
Set your server
p4 set P4PORT= xx.xxx.xx.xxx:xxxxx
Set your user name
p4 set P4USER=username
Set your password
In terms of setting your password, you could just set your password in plain text by the following command:
p4 set P4PASSWD=yourpasswd
If you want to secure your password, you could download the MD5 encryptor to encrypt your password.
p4 set P4PASSWD=hashedpasswd
Set you client (workspace)
In order to select your workspace, you could use the following command:
p4 set P4CLIENT=nameofworkspace
The name of your workspace could look like: username_hostmachinename_numbers.
Set your ignore file
You can set up your ignore file so that when adding your project to perforce, some files (building results) could be automatically ignored.
p4 set P4IGNORE= filepath