SAC Automation, Scripting, and Virtualization 4

Question 1

What does the 'shebang' line '#!/usr/bin/env python3' at the top of a script do?

Accepted Answer

Tells the OS to execute the script using the python3 interpreter found in PATH

Answer

The shebang combined with /usr/bin/env locates python3 dynamically in PATH, making the script portable across systems.

Question 2

In VMware vSphere, what resource pool feature prevents a single VM from consuming all CPU resources on a host?

Accepted Answer

CPU Limits and Reservations

Answer

CPU limits cap the maximum MHz a VM can use, while reservations guarantee a minimum, preventing resource starvation.

Question 3

Which sed command replaces the first occurrence of 'error' with 'warning' in each line of a file?

Accepted Answer

sed 's/error/warning/' file

Answer

Without the 'g' flag, sed's substitute command replaces only the first match per line.

Question 4

What is the primary purpose of Infrastructure as Code (IaC) tools like Terraform or CloudFormation?

Accepted Answer

Provisioning and managing infrastructure through machine-readable configuration files

Answer

IaC tools let administrators define infrastructure in code, enabling version control, repeatability, and automated provisioning.

Question 5

In a Bash script, what does 'set -e' at the beginning accomplish?

Accepted Answer

Causes the script to exit immediately if any command returns a non-zero exit code

Answer

set -e (errexit) makes the shell exit on the first command failure, preventing scripts from silently continuing after errors.

(SAC) System Administration Certification Practice Test