How to switch to the shell you want

Firstly you can show all of the shells you have:

chsh -l

then just input the file path of the shell you want,you can enter the shell you want.

Here are the common shells you will meet:

/bin/sh    //the shell used in the early time
/bin/bash  //usually default shell
/bin/tcsh  //advanced csh.
/bin/csh   //often used on unix
/bin/ksh   // popular in Unix ,has many features of csh