Dont forget to install the image-processing commands from ImageMagick

 One of the useful Unix commands I have used is "convert" from ImageMagick.  This software survived several upgrades of MacOS, but not the transition to MacOS 15.4 Sequoia.  To re-install via MacPorts, one does this following

 sudo port selfupdate

 sudo port upgrade outdated

sudo port install imagemagick

and this places the Unix line-command "convert" into /opt/local/bin