[R-SIG-Mac] Macports installation problem

[John]

Hi,

   I tried to install Cairo graphics

https://www.cairographics.org/download/

   and I need to install Macports.

   I tried to install Macports on my Mac OS Sierra 10.12.6, and type "sudo
port install cairo", but it did not respond. I haven't seen any file name
or app called Macports, but one file called "port" which is located at

loca/bin/port"

   How should I do it?

   Thanks,

John
*******

Last login: Sun Oct 15 02:52:49 on console
Johns-MacBook-Pro:~ john$ /opt/local/bin/port ; exit;
MacPorts 2.4.2
Entering shell mode... ("help" for help, "quit" to quit)
[Users/john] > sudo port install cairo
Error: Unrecognized action "port sudo"

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