system PATH
On command
echo $PATH are displayed these paths by default. Each path is separated by colon and specificaly these are stored in etc/paths file.
/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin
add PATH
cd or cd ~ takes you to home directory
sudo nano ~/.profile opens hidden file ".profile" in Terminal editor
type export PATH="/Applications/Blender/blender.app/Contents/MacOS:$PATH"
and save it (Ctrl+x). That's all
Note 1: After XQuartz installation (needed to run Inkscape) you can see on echo $PATH also /opt/X11/bin path that is located in etc/paths.d/40XQuartz file. So, if you close and open a new Shell (Terminal window) you should see these path on echo $PATH command like this
/Applications/Blender/blender.app/Contents/MacOS:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/opt/X11/bin
Note 2: You can add PATH also by editing ".profile" file from Finder. Let "Show hidden files" with Cmd+Shift+. Go to Macintosh HD > Users > "youraccount" folder and open ".profile" file in TextEdit and copy paste
PATH=/Applications/Blender/blender.app/Contents/MacOS:$PATH and save it. If you open a new Shell you can see the path on echo $PATH command.
Note 3: I saw paths can be stored in other files like ".bash_profile" if any, but since I already created alias for blender, it make sence to me store also this PATH in one file. Also other app generated the path to this .profile file, so I hope it's correct :)
Note 4: path /Applications/Blender/blender.app/Contents/MacOS works only in case your blender.app is in "Applications" directory. If you placed your app somewhere else edit the text acording to your path. You can get the path by drag&drop "MacOS" folder into Terminal window. To get such deep directory click on blender app icon with RMB and choose "Show package content".
Note 5: Be carefull with quotation marks. They has to be traight "abc" Pasting them from text editor they can be also 6-9 type, looks like angeled “abc”. These are not working!