Open terminal and type:
1. Create a directory at ~/bin:
mkdir ~/bin
2. Copy Sublime executable to your ~/bin directory:
ln -s "/Applications/Sublime Text.app/Contents/SharedSupport/bin/subl" ~/bin/subl
3a. If using bash (Mac OS default) add line to ~/.bash_profile file:
echo 'export PATH=$PATH:$HOME/bin' >> ~/.bash_profile
4a. Set Sublime Text as your default editor
echo "export EDITOR='subl' -w">> ~/.bash_profile
or
3b. Add line to ~/.zshrc file:
echo 'export PATH=$PATH:$HOME/bin' >> ~/.zshrc
4. Restart terminal and type:
subl .
Sublime should open up in the current directory.
5. Check unix commands:
ls
You should get a directory listing.
Sublime Text Documentation: https://www.sublimetext.com/docs/3/osx_command_line.html