PATH is an environmental variable in Linux and other Unix-like operating systems that tells the shell which directories to search for executable files.
So, after we add to the PATH variable a path to our executable file, then we can launch our executable without writing a full path to it.

Try running all these commands yourself and you‘ll get the answer (here are only two existing commands, which comprise the correct answer)

“A free-software license is a notice that grants the recipient of a piece of software extensive rights to modify and redistribute that software.“ (?) Wikipedia

The su command allows us to switch to another user in the current session. It actually stands for ‘switch user‘.

/etc/passwd file contains list of OS users including UID, GID, shell, home dir…
/etc/group file contains list of groups, registered on OS including group name, GID, its members…

The dmesg command is a Linux utility that displays kernel-related messages retrieved from the kernel ring buffer. The ring buffer stores information about hardware, device driver initialization, and messages from kernel modules that take place during system startup.

–help is an option to call brief help for the command

The correct way to assign the value to the variable is demonstrated in the screenshot:

1. we need -r or -R option when using cp command to copy all subdirectories
2. no need of dot between asterisks (which implies that the file should have an extension – that is not the necessary case in Linux)

[?] A regular expression followed by a question mark (?) matches zero or one occurrences of the regular expression. (correct answer)
[*] A regular expression followed by an asterisk (*) matches a sequence of zero or more occurrences of the regular expression.
[+] A regular expression followed by a plus sign (+) matches one or more occurrences of the regular expression.
[$] Match the end of the line.

rmdir command is used to delete empty directories (so-called safe deletion).
As well, rm command has -r option, which means deletion of the folders.
So, we can use either way to remove an empty folder.

Internet as a Service is made up transcription of IaaS.
The same with Graphics as a Service, as GaaS alias usually stands for ‘Gaming-as-a-service‘.
Other answers are correct.

Python is a script programming language.
NGINX is a web server.
Samba is a Windows interoperability tool.
MySQL is a database server.

grep (stands for global regular expression print) is a command to search some text by using patterns (including regular expressions)
less is a text file viewer (not a search tool)
cut is a command to remove substrings from lines of text (not a search tool as well)
igrep – there is no such command in Linux (you can write one yourself, though)

Internet cookies are small bits of data that are stored as text files on a browser. In short, Internet cookies function to associate these bits of data to specific users. To accomplish this, they must contain at least two pieces of data: a unique user identifier and some information about that unique user.
Most cookies are not harmful, but tracking cookies can jeopardize user privacy because they can track an individual‘s browsing patterns and history.

A Linux package repository is a storage location that contains essential and popular software for different Linux distributions and, each distribution has its own official repositories.
And this is exactly the place where Linux software (packages) are supposed to be taken from by default.
Why not A CD-ROM disk? Because of the need for being up-to-date.
Why not The vendor‘s website? Because it‘s not what it‘s meant for. The website has absolutely other purposes.
Why not A retail store? What is it? You tell me! 😉

A recursive directory listing can be done by typing ls -R command. And its output includes only the content of sub-directories (in terms of presented answers).
You can find more help on this command by typing ‘ls –help‘ in the console.

A Linux distribution (often abbreviated as distro) is an operating system made from a software collection that includes the Linux kernel, a package management system and other system utilities.
So, a distro is not a file system, not a set of rules, not a set of changes to Linux. It‘s about compiled OS kernel.

In Linux terminal we can split a command across multiple lines by using backslash symbol (as it illustrated in screenshot below).

To accomplish the task from the question (sorting the output of the command export-logs) you should use Linux pipeline which is implemented by a vertical slash symbol: ‘|‘

The main purpose of the passwd command is to change user‘s password. But it can lock user as well by using -l option.