There are several default environment variables that are automatically set in the Bash shell. Here are some common default Bash shell variables:
HOME: This variable stores the path to the current user's home directory.
USER: The username of the current user.
SHELL: The path to the current user's default shell.
PWD: The present working directory (the directory you are currently in).
PATH: A colon-separated list of directories where the shell looks for executable files.
PS1: The primary prompt string that defines the appearance of the command prompt.
PS2: The secondary prompt string used when an incomplete command needs continuation.
IFS: Internal Field Separator. It defines the delimiter characters used for word splitting in commands.
HOSTNAME: The hostname of the machine.
OSTYPE: The operating system type.
OLDPWD: The previous working directory before the last cd command.
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