Added macports notes to the knowledge base

knowledge base/macports.md

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+# Macports
+
+See the [website] for the installation instructions.
+
+Default ports install location is `/opt/local`.
+
+## TL;DR
+
+```shell
+# get help on a command
+port help install
+port help select
+
+# search for ports
+port search completion
+port search --name parallel
+
+# get info on a specific port
+port info zsh-completions
+
+# get a port's variants
+port variants k9s
+
+# install ports
+sudo port install zsh-completions apple-completion
+sudo port install nmap -subversion                  # use a variant
+sudo port install -d gettext                        # debug mode
+
+# list all installed ports
+port installed
+port echo installed
+
+# list all ports that have been explicitly installed by the user
+port echo requested
+
+# list all available ports
+port list
+port list nmap   # limit to all versions of a package
+
+# list all files installed by a port
+# the port must be installed for this to work
+port contents py38-netaddr
+
+# list ports providing a file
+# the port must be installed for this to work
+port provides /opt/local/bin/envsubst
+
+# remove a port
+sudo port uninstall --follow-dependencies fzf
+
+# list available choices for a group
+port select --list python
+
+# show the current port selection
+port select --summary
+
+# set a default version
+sudo port select --set postgresql postgresql12
+
+# update macports itself to the latest version and sync the latest ports definitions
+sudo port selfupdate
+
+# deactivate an active port
+sudo port deactivate stow
+# activate an inactive port
+sudo port activate stow
+
+# list all outdated ports
+port echo outdated
+
+# upgrade a port
+sudo port upgrade tree
+
+# upgrade all outdated ports
+sudo port upgrade outdated
+
+# clean out all temporary assets of a port
+sudo port clean -f --all parallel
+
+# clean up leftovers
+sudo port reclaim
+
+# list all inactive ports
+# ports are deactivated when a newer version gets installed
+port echo inactive
+
+# remove all inactive ports
+sudo port uninstall inactive
+
+# list a port's dependencies
+port deps chezmoi
+
+# recursively list all ports depending on the given port
+port rdeps pcre
+
+# list the installed ports depending on the given port
+port dependents bzip2
+
+# recursively list all the installed ports that depend on this port
+port rdependents libedit
+
+# view a port's notes if any are available
+# notes are displayed right after a port is installed
+# the port must be installed for this to work
+port notes postgres12
+
+# get the path of a port within the ports tree
+port dir zlib
+
+# get the path of the tarball of a port
+# the port must be installed for this to work
+port location readline
+
+# get the path to a port's portfile
+port file openssl11
+
+# get the path of the working directory for a port if it exists
+port work popt
+```
+
+## Further readings
+
+- [Website]
+- Official user [guide]
+- Public [ports] database
+- [cheat.sh]
+
+[guide]: https://guide.macports.org/
+[ports]: https://ports.macports.org/
+[website]: https://www.macports.org/
+
+[cheat.sh]: https://cheat.sh/port