Which of the following commands would a technician use to move one directory above or below the one the technician is currently in?

isis

Do you remember the 21st night of September?
Love was changing the minds of pretenders
While chasing the clouds away

Our hearts were ringing
In the key that our souls were singing.
As we danced in the night,
Remember how the stars stole the night away

Ba de ya, say do you remember
Ba de ya, dancing in September
Ba de ya, never was a cloudy day

Ba de ya de ya de ya
Ba de ya de ya de ya
Ba de ya de ya de ya de ya