Shells in UNIX based systems can be started up in login and non-login modes:
A login shell is a shell given to a user upon login into their user account. This is initiated by using the -l or --login option, or placing a dash as the initial character of the command name, for example invoking bash as -bash.
Sub shell, also called a non-login shell is a shell started after the login process without the -l or --login option and without an extra dash before the command name.
The general cases for having a login shell include:
Accessing your computer remotely using ssh.
Simulating an initial login shell with bash -l or sh -l.
Simulating an initial root login shell with sudo -i.
You can allow Terminal to start a login shell. Your default shell will be started with a dash character prepended to its name.
Press the menu button in the top-right corner of the window and select Preferences.
In the sidebar, select your current profile in the Profiles section.
Select Command.
Under the Command label, select Run command as a login shell.
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