Change Shell To Bash in Linux / Unix

How do I switch from a ksh shell to bash on Linux or Unix system? How to change shells on Unix-like system?

A shell is nothing but a command that provides a text-only user interface (also known as “command line interface”) for Linux, MacOS, and Unix-like operating systems. Bash shell read commands such as ls, date and others typed into a terminal and then run them. That is the primary function of bash shell.

How do I find out the default shell for a user?

Type the following command to find out the default shell for a user named vivek using the grep command and /etc/passwd file:
$ grep vivek /etc/passwd
vivek:x:1005:1005:,,,:/home/vivek:/bin/zsh
OR
$ ps -p $$
PID TTY TIME CMD
14314 pts/9 00:00:00 zsh
OR
$ echo $0
zsh
All of the above output indicates that the shell is zsh for user named vivek in Linux operating system.

How do I see what shells are available on my system?

Type the cat command as follows:
$ cat /etc/shells
Sample outputs:

How do I switch to a bash or different shell?

Type the name at the command line and then press the enter key. In this example, to change from any shell to the bash, type:
bash

How to change shells on a Linux or Unix-like systems?

You can change your default shell using the chsh (“change shell” ) command as follows. The syntax is:
chsh
chsh -s {shell-name-here}
chsh -s {shell-name-here} {user-name-here}
chsh -s /bin/bash
chsh -s /bin/bash vivek
You can find full path to your shell using the following command:
type -a bash
type -a zsh
type -a ksh
Please note that a normal user may only change the login shell for her own account. The superuser (root) may change the login shell for any account using the following syntax:
$ sudo chsh -s /bin/bash raj
OR use the su command instead of sudo command:
$ su -
# chsh -s /bin/bash monika

Summing up

The only restriction placed on the login shell is that the shell command name must be listed in /etc/shells, unless the invoker is the superuser/root user, and then any value may be added. An account with a restricted login shell may not change her login shell. For this reason, placing /bin/rsh in /etc/shells is discouraged since accidentally changing to a restricted shell would prevent the user from ever changing her login shell back to its original value.

Category	List of Unix and Linux commands
File Management	cat
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Network Utilities	dig • host • ip • nmap
OpenVPN	CentOS 7 • CentOS 8 • Debian 10 • Debian 8/9 • Ubuntu 18.04 • Ubuntu 20.04
Package Manager	apk • apt
Processes Management	bg • chroot • cron • disown • fg • jobs • killall • kill • pidof • pstree • pwdx • time
Searching	grep • whereis • which
User Information	groups • id • lastcomm • last • lid/libuser-lid • logname • members • users • whoami • who • w
WireGuard VPN	Alpine • CentOS 8 • Debian 10 • Firewall • Ubuntu 20.04