complete command in zsh
//First open .zshrc file and then copy past the lines below!
open .zshrc
autoload -U compinit promptinit
compinit
zstyle ':completion:*' matcher-list 'm:{a-zA-Z}={A-Za-z}' 'r:|=*' 'l:|=* r:|=*'
fpath=(/usr/local/share/zsh-completions $fpath)