When I execute those commands I get this result: iMac-de-Jordi:Library jeam$ ruby -e "$(curl -fsSL raw.githubusercontent.com/Homebrew/install/master/install)" < /dev/null 2> /dev/null ==> This script will install: /usr/local/bin/brew /usr/local/share/doc/homebrew /usr/local/share/man/man1/brew.1 /usr/local/share/zsh/site-functions/_brew /usr/local/etc/bash_completion.d/brew /usr/local/Homebrew iMac-de-Jordi:Library jeam$ brew install python -bash: brew: command not found iMac-de-Jordi:Library jeam$ iMac-de-Jordi:Library jeam$ brew install netpbm -bash: brew: command not found iMac-de-Jordi:Library jeam$ It seems that brew is not found.Read More...