chroot is used to set the 'root' of the VFS of a process

It is often used to create a "chroot jail"

It is often also pronounced as "cheroot"

It is an internal command in the shell used to modify the shell process's current working directory

cd is a shell wrapper of the chdir() system call

renice is used to alter the priority of a running process.

It is a variant of the 'nice' command that can be used to start a process with a set nice value.

kill is used to send a signal to a running process

fakeroot intercepts system calls to make the running process believe as though it is running as root.

it is used to do harmless activities like creating archives that must have files with root permission/ownership.

fakeroot is not a security violation.

Set CPU affinity of a process.

CPU affinity controls which physical processor a given process should run on.