I use Centos $9.$ Please help me with Lab $10\mathrm{.}1$

$1.$Launch the command $dd$ if$=/$dev$/$zero of$=/$dev$/$null three times as a background job.

$2.$ Increase the priority of one of these commands using the nice value $-5.$ Change the priority of

the same process again, but this time use the value $-15.$ Observe the difference.

$3.$ Kill all the dd processes you just started.

$4.$ Ensure that tuned is installed and active, and set the throughput$-$performance profile.