brew install <formula> 2>&1 | tee install.log
So where exactly is this install.log file going to end up, and what exactly the
2>&1 | tee part of the command mean?
Ask Different is a question and answer site for power users of Apple hardware and software. It only takes a minute to sign up.Sign up to join this community
tee command prints the piped stdout to the file path given as well as displaying it in the terminal. This is commonly used for recording the output of commands to file which would otherwise only be ephemerally printed to the terminal.
Without tee and using simple redirection of
brew install > install.log would prevent stdout being printed to the terminal as well as the file, requiring the file to be accessed to view the messages.
2>&1 redirects stderr to stdout alongside the existing stdout, meaning that the error messages are redirected as normal output.
Without this, tee would only print stdout without the error messages to the install log.
install.log is relative to the current directory.