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Zsh
, 
Fish
, and 
ksh
, but Bash is the default command shell for the majority of Linux 
distributions. It's even available on macOS (although the default on that platform 
is Zsh nowadays), as well as in Windows by installing the Windows Subsystem 
for Linux. Therefore, by understanding the basics of Bash, your knowledge will be 
compatible with other distributions and platforms. While it's fun to learn other shells 
such as Zsh, Bash is definitely the one to focus the most attention on if you're just 
starting.
You may wonder, then, where you configure the shell that your user account will 
use. If you recall from 
Chapter 2
, 
Managing Users and Permissions
, we looked at the 
/etc/passwd
 file. As I'm sure you remember, this file keeps a list of user accounts 
available on the system. Go ahead and take a look at this file to refresh yourself by 
entering the following command:
cat /etc/passwd
This will produce an output like the one shown in 
Figure 6.1
:
Figure 6.1: The last several lines of a sample /etc/passwd file
See the last field in every entry? That's where we configure which shell is launched 
when a user logs in or starts a new terminal session. Unless you've already changed 
it, the entry for your user account should read 
/bin/bash
. You'll see other variations 
in this file, such as 
/bin/false
 or 
/usr/sbin/nologin
. 

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Chapter 6