What is the difference the == and =~ comparison operators when used in BASH double square bracket if conditionals?

Using backreferences in a POSIX regular expression, which word would this pattern match? (ss).*\1

To run CGI scripts with Apache, you need to _.

To permanently add NAT to the default zone using firewalld, you would use which command string?

What is the difference between using = and == in a BASH double square bracket if conditional? n (==) checks equality.

To repeat the last command in the bash shell history, type...

What does it means when the ps commands shows a 'Z' in the status column for a process?

What is GNOME ?

what the 'cd /' command do?

Which firewall is most commonly used on Linux?