I use Debian, and I'm aware. Bash still uses primarily POSIX sh syntax, with extensions. It's helpful for people to be able to apply knowledge from the command

I use Debian, and I'm aware. Bash still uses primarily POSIX sh syntax, with extensions. It's helpful for people to be able to apply knowledge from the command line to shell scripting and vice versa, even if they have to do a bit of porting work, rather than using completely different shells and syntax.