The default style of the cursor in the terminal of most distros is a big blinking block. This can be changed to either just a underline or a thinner block as follows.
-> open a terminal
-> run the command
-> In the window that will pop out , look at window on the right. The highlighted line will have cursor_shape
in the first column and the value "block" in the second column.
-> To change this, click on the second column and enter the value "underline" to have the cursor as an underline or enter "ibeam" to use a vertical line cursor.
-> Hit the enter key after entering the new value
-> click on file and quit.
Your terminal cursor would have changed to what ever new value you chose.