http://www.perforce.com/perforce/downloads/index.html 
The Perforce client programs are typically downloaded to /usr/local/bin.

Perforce Configuration and Workspace Setting
Method 1
Using Config Files:
Config files are text files containing Perforce settings that are in effect for files in and below the directory where the config file resides. Config files are useful if you have multiple client workspaces on the same machine. By specifying the settings in config files, you avoid the inconvenience of changing system settings every time you want to work with a different work-space.
To use config files, you define the P4CONFIG environment variable, specifying a file name (for example, .p4config). When you issue a command, Perforce searches the current working directory and its parent directories for the specified file and uses the settings it contains (unless the settings are overridden by command-line flags).
P4CONFIG = .p4config
Each setting in the file must be specified on its own line, using the following format:
setting=value

The following settings can be specified in a config file.

For details about these settings, refer to the Perforce Command Reference.

Example: Using config files to handle switching between two workspaces
Ona switches between two workspaces on the same machine. The first workspace is ona-ash. It has a client root of /tmp/user/ona and connects to the Perforce server at ida:1818. The second workspace is called ona-agave. Its client root is /home/ona/p4-ona, and it uses the Perforce server at warhol:1666.

Rama sets the P4CONFIG environment variable to .p4config. She creates a file called .p4config in /tmp/user/rama containing the following text:
P4PORT=ida:1818
P4CLIENT=ona-ash

She creates a second .p4config file in/home/rama/p4-ona. It contains the following text:
P4PORT=warhol:1666
P4CLIENT=ona-agave

Any work she does on files under /tmp/user/rama is managed by the Perforce server at ida:1818 and work she does on files under /home/rama/p4-ona is managed by the Perforce server at warhol:1666.

Method 2: Environment Variable Setting

To configure server connection settings using environment variables, set P4PORT to host:port, as in the following examples.

Example:
export P4PORT=X.X.X.X\:1667
export P4PASSWD=pass
export P4USER=user
export P4CLIENT=Sonar
export PATH

Defining client workspaces 
To define a client workspace:

$ P4CLIENT=bruno_ws ; export P4CLIENT

Perforce displays the client specification form in your text editor.

The minimum settings you must specify to configure a client workspace are:

The workspace name defaults to the client machine’s hostname, but a client machine can contain multiple workspaces. To specify the effective workspace, set P4CLIENT.

The client root is the top directory of your client workspace, where Perforce stores your working copies of depot files. Be sure to set the client root, or you might inadvertently sync files to your client machine’s root directory.

Note:
To specify server settings on the command line, use the -p flag. For example:
p4 -p localhost:1776 sync //depot/dev/main/jam/Jambase

Reference:
http://www.perforce.com/perforce/doc.current/manuals/p4guide/02_config.html#1069873 
http://www.perforce.com/perforce/doc.current/manuals/p4guide/02_config.html#1071378 
http://www.perforce.com/perforce/doc.current/manuals/p4guide/01_install.html#1070774

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