010-160 010-160 - LPI Linux Essentials Process Management and System Monitoring Questions and Answers 3

Question 1

Which command displays the process ID (PID) of a running program by its name?

Accepted Answer

pidof

Answer

The `pidof` command returns the PID(s) of a named running program, making it easy to script process management tasks.

Question 2

What is the parent process of all other processes on a Linux system, typically having PID 1?

Accepted Answer

init (or systemd)

Answer

The init process (or systemd on modern systems) is the first process started by the kernel and is the ancestor of all other processes with PID 1.

Question 3

Which command shows a tree view of processes illustrating parent-child relationships?

Accepted Answer

pstree

Answer

The `pstree` command displays running processes in a hierarchical tree format, clearly showing parent-child relationships between processes.

Question 4

What does the `df` command report on a Linux system?

Accepted Answer

Disk filesystem space usage

Answer

The `df` (disk free) command reports the amount of used and available disk space on mounted filesystems.

Question 5

Which signal sent by `kill` gracefully requests a process to terminate, allowing cleanup?

Accepted Answer

SIGTERM (15)

Answer

SIGTERM (signal 15) is the default signal sent by `kill`, asking the process to terminate gracefully and perform cleanup operations.

(010-160) LPI Linux Essentials Practice Test