To post to twitter from the command line as of Oct 8, 2018. (Twitter is always changing though.) Homebrew is a package manager for Mac. You can use it to download and install things. Oysttyer is a CLI (command line interface) for Twitter. 1.) Install Homebrew, a package manager for Mac. Copy and paste the following to install brew. More information about brew here https://brew.sh/ mkdir $HOME/.brew && curl -fsSL https://github.com/Homebrew/brew/tarball/master | tar xz --strip 1 -C $HOME/.brew mkdir -p /tmp/.$(whoami)-brew-locks mkdir -p $HOME/.brew/var/homebrew ln -s /tmp/.$(whoami)-brew-locks $HOME/.brew/var/homebrew/locks export PATH="$HOME/.brew/bin:$PATH" brew update && brew upgrade 1b.) Afterwards make sure you add the following lines to your .zshrc. mkdir -p /tmp/.$(whoami)-brew-locks export PATH="$HOME/.brew/bin:$PATH" The ~/.zshrc doesn’t exist by default in Mac OS X so you may need to create it. The ~/ translates to you