zsh: enable iterm2 integration This is the iterm2 integration script as of today. Squinting a bit, this looks like the version of the file from https://github.com/gnachman/iTerm2/commit/3d8173763e1e7f53c08a7da52fc92db4e036395a, which is the most recent edit to the file on github.

function certfor() {
  if [ "x$1" = "x" ] ; then
    echo 'abort: specify host:port pair as argument'
    return 1
  fi
  openssl x509 -in <(echo | openssl s_client -showcerts -connect $1 | \
    awk '/-----BEGIN CERTIFICATE-----/,/-----END CERTIFICATE-----/') -noout -text
}