This command to pipe results and search for uppercase letters is not working. Getting "no such file or directory" error

Question

I am doing an assignment and there is a part that says to put in this command that is supposed to pipe results and search for uppercase letters.

Here is the command it says to put in:

grep -E "[a-z]" rawpassword.txt | grep – E "[A-Z]" >passwd.txt

but whenever I put it in I get the error "[A-Z]": No such file or directory.

Is there a typo in the command or something?

Answer 1

suggestion 1:

  grep "[a-z]" rawpassword.txt | grep  "[A-Z]" >passwd.txt

suggestion 2:

  awk '/[a-z]/ && /[A-Z]/' rawpassword.txt >passwd.txt