I'm sure it's been done before, but here's a script which dumps asn information from PEM encoded x509 certificate files

dump-x509-multi-cert-file.awk

#!/usr/bin/awk -f

# Takes a single argument, the path to a file containing PEM encoded certificate(s)

BEGIN{count=0}

/-----BEGIN CERTIFICATE-----/{
  count++
  items[count] = $0
}
/-----END CERTIFICATE-----/{
  items[count] =  items[count] "\n" $0
}
!/---/{
  items[count] =  items[count] "\n" $0
}
END{    
  for (item in items) { 
    sanitize="| tr -cd '[a-zA-Z0-9= -\(\):<>+\.\/\n]' |"
    cmd = "cat <<END " sanitize " openssl x509 -noout -text "
    cmd = cmd "\n" "END"
    system(cmd)
  }
}

really wonder if this enough... this script is only for use with trusted input sources

tr works on OS-X irrespective of the position of the newline ('\n') in the list of allowed characters, on Linux it crashes unless it's the last character in the list.