Issues in lab 25.2
The answer to question 2 doesn't make sense to me.
Find out what current PIDs are being issued
$ cat &
$ kill -9 29222
The solution only shows you the PID for cat (granted, it's an example of the current number range available which seems the point) and it doesn't need to be killed as it is stopped soon after execution (on CentOS).
Wouldn't the better answer either be 'jobs -p' or 'ps [-ef]'?
Again, in question 4, cat does not need to be killed..
Also there's a minor typo in the second paragraph of the PDF: 'However, when the PID reaches the value shown [in is missing] /proc/sys/kernel/pid_max'