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Change the default shell in Terminal
You can change the default shell that new Terminal windows and tabs open with.
Choose Terminal > Preferences, then click General.
Under “Shells open with,” select “Command (complete path),” then enter the path to the shell you want to use.
In a networked environment, a system administrator can specify the default shell. For more information about the features of each shell, enter “man” and the name of the shell.