Please help me in this , even though i tried a lot but it woulkdent work , i also tried by restarting the terminal but it was not working please help me

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hi , welcome to the forum.
Which exercise or challenge is this. Please include a link to it.

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try exiting the terminal (closing it)

Then click the Reset button next to the Run button.

Then after that, start a new terminal.

Type ls.