4.1 Bash shell section correction

[s0k11 0]

Hi,

This paragraph is wrong, I think it need a better explanation..

Why freebsd is a legacy system? the last version is 12.1 is from November 2019,  freebsd have graphical interface, https://en.wikipedia.org/wiki/FreeBSD#Desktop_and_laptop

Kali linux is based on Debian. and Debian was released on Sept 1993, Freebsd on Nov 1993.