I am lost trying ot complete the following and keep getting an error:

The command tells docker to build an image $($build$),$ with the name test$-$dockerfile $(-$t means we are providing a name$),$ and to use the current directory $(.).$ So the command format is:

docker build $-$t

When executed you will get the following output:

Sending build context to Docker daemon $2\mathrm{.}048$kB

Step $1/2$ : FROM ubuntu:latest

latest: Pulling from library$/$ubuntu

$6$b$98$dfc$16071$: Pull complete

$4001$a$1209541$: Pull complete

$6319$fc$68$c$576$: Pull complete

b$24603670$dc$3$: Pull complete

$97$f$170$c$87$c$6$f: Pull complete

Digest: sha$256$:$5$f$4$bdc$3467537$cbbe$563$e$80$db$2$c$3$ec$95$d$548$a$9145$d$64453$b$06939$c$4592$d$67$b$6$d

Status: Downloaded newer image for ubuntu:latest

$--->113$a$43$faa$138$

Step $2/2$ : CMD $["$echo$","$It worked!"$]$

$--->$ Running in $3$fcfdc$028360$

Removing intermediate container $3$fcfdc$028360$

$--->4482338$d$49$b$4$

Successfully built $4482338$d$49$b$4$

Successfully tagged test$-$dockerfile:latestI n