system PATH
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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
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`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
`export 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 (in that case you need to type only path like `/Applications/Blender/blender.app/Contents/MacOS` on separate line), but since I already created [alias][1] for blender, it make sence to me store also this PATH in one file. I noticed some apps generated already `export PATH="...:$PATH"` command to `~/.profile` so I just mimic that command for blender and it worked. 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".







  [1]: https://blender.stackexchange.com/a/2160/2214