Explain the use of the following commands with examples wherever applicable:

$1.$ U

$2.$ Esc

$3.$ q$!$

$4.$ x

$5.$ dd

$6..($dot$)$

$7.$ R

$8.?$

$9.$ $

$10.0($zero$)$

$11.$ w

$12.$ u

$13.$ wq