How do you activate the noclobber shell option?

Executing 'pwd' in shell will return:

Fedora Linux uses _____ packages.

Ubuntu is based on...

To query DNS (Internet domain name) servers, you use the command:

_____ is a Linux desktop environment'.

Using alternation in a POSIX-extended regular expression, which numbers would this pattern match? ^(([0-9][0-9]?)|(2[0-9][0-9]))$

What would be in out.txt?

What is the difference between reading the list of disk partitions from /proc/partitions and getting it using fdisk -l?

With GNU tools such as a GNU grep, awk, and sed, what is the difference between basic regular expressions (BREs) and extended regular expressions (EREs)?

When installing a downloaded package on the RedHat-based distribution manual using RPM, what may you have to do first?