1. Introduction
2. Installing MacPorts
2.1. Install Xcode
2.2. Install MacPorts
2.3. MacPorts Upgrade
2.4. Uninstall
2.5. MacPorts and the Shell
3. Using MacPorts
3.1. The port Command
3.2. Port Variants
3.3. Common Tasks
3.4. Port Binaries
4. Portfile Development
4.1. Portfile Introduction
4.2. Creating a Portfile
4.3. Example Portfiles
4.4. Port Variants
4.5. Patch Files
4.6. Local Portfile Repositories
4.7. Portfile Best Practices
4.8. MacPorts' buildbot
5. Portfile Reference
5.1. Global Keywords
5.2. Global Variables
5.3. Port Phases
5.4. Dependencies
5.5. Variants
5.6. Tcl Extensions & Useful Tcl Commands
5.7. StartupItems
5.8. Livecheck / Distcheck
5.9. PortGroups
6. MacPorts Internals
6.1. File Hierarchy
6.2. Configuration Files
6.3. Port Images
6.4. APIs and Libs
6.5. The MacPorts Registry
7. MacPorts Project
7.1. Using Trac for Tickets
7.2. Contributing to MacPorts
7.3. Port Update Policies
7.4. Updating Documentation
7.5. MacPorts Membership
7.6. The PortMgr Team
8. MacPorts Guide Terms

MacPorts has a unique ability to allow multiple versions, revisions, and variants of the same port to be installed at the same time, so you may test new port versions without uninstalling a previous working version.

This capability derives from the fact that a MacPorts port by default is not installed into its final or activated location, but rather to an intermediate location that is only made available to other ports and end-users after an activation phase that extracts all its files from the image repository. Deactivating a port only removes the files from their activated locations (usually under ${prefix}) —the deactivated port's image is not disturbed.

The location of an installed port's image can be seen by running:

%% port location PORTNAME