Cannot install graphviz with macports I am struggling with macports trying to install graphviz tool:

... $ sudo port install graphviz
---&gt;  Computing dependencies for graphviz
---&gt;  Fetching archive for graphviz
---&gt;  Attempting to fetch graphviz-2.40.1_1+pangocairo+x11.darwin_18.x86_64.tbz2 from https://packages.macports.org/graphviz
---&gt;  Attempting to fetch graphviz-2.40.1_1+pangocairo+x11.darwin_18.x86_64.tbz2 from http://mse.uk.packages.macports.org/sites/packages.macports.org/graphviz
---&gt;  Attempting to fetch graphviz-2.40.1_1+pangocairo+x11.darwin_18.x86_64.tbz2 from http://lil.fr.packages.macports.org/graphviz
---&gt;  Fetching distfiles for graphviz
---&gt;  Verifying checksums for graphviz
---&gt;  Extracting graphviz
---&gt;  Configuring graphviz
---&gt;  Building graphviz
---&gt;  Staging graphviz into destroot
---&gt;  Installing graphviz @2.40.1_1+pangocairo+x11
---&gt;  Activating graphviz @2.40.1_1+pangocairo+x11
---&gt;  Cleaning graphviz
---&gt;  Scanning binaries for linking errors
---&gt;  No broken files found.
---&gt;  No broken ports found.
... $ graphviz
-bash: graphviz: command not found
... $ which graphviz
... $ sudo port installed
The following ports are currently installed:
...
  graphviz @2.40.1_1+pangocairo+x11 (active)
...


Literally have no idea what did I wrong. Any help will be appreciated.
Sometimes when you install command line software, the software is actually a package that contains a collection of binaries (or library source files) and according to the Portfile description of graphviz, it's one of those packages:


  The Graphviz layout programs dot, neato, fdp, sfdp, twopi and circo
  take descriptions of graphs in a simple text language, and produce
  output in a variety of visual and text formats.


I personally don't use MacPorts but according to this answer it seems like you can view the binaries (and library source files) installed by a package through:

port contents installed_port_name