In Linux, the _____ command is used to display the status of jobs in the current session.
- jobs
- top
- ps
- tasklist
In Linux, the jobs command is used to display the status of jobs in the current session. It provides information about background processes or jobs started within the current shell session.
The _________ command in Linux can be used to manipulate or display IP routing tables.
- route
- ifconfig
- iptables
- ip
The ip command in Linux can be used to manipulate or display IP routing tables. It's a powerful and versatile tool for configuring network interfaces, routes, tunnels, and more. Unlike older commands like route and ifconfig, ip is considered a modern and more comprehensive replacement.
You are debugging an application and need to trace the system calls it makes. Which tool in Linux would you employ?
- strace
- ltrace
- gdb
- valgrind
To trace the system calls made by an application on Linux, you would use the strace tool. It provides detailed information about the system calls, signals, and other interactions the application has with the operating system, which is valuable for debugging and analysis.
protocol is considered to be highly secure and is commonly used in Linux?
- OpenVPN
- PPTP
- L2TP
- IPSec
OpenVPN is considered highly secure and commonly used in Linux. It's an open-source VPN protocol that provides strong encryption and is widely trusted for creating secure network connections.
The ________ command in Linux allows you to enforce a user to change their password upon the next login.
- passwd
- chsh
- chfn
- usermod
The "passwd" command in Linux allows you to enforce a user to change their password upon the next login. This is often used for security reasons, such as when a user's password has expired.
The _________ utility is used to create, grow, shrink, and repair ext2, ext3, and ext4 file systems.
- resize2fs
- mkfs
- df
- lsblk
The correct option is resize2fs. The resize2fs utility is used to resize (grow or shrink) ext2, ext3, and ext4 file systems. It allows you to adjust the size of the file system to match the size of the underlying disk or partition. This is a crucial tool for managing file system sizes in Linux.
You've encountered a do-while loop in a codebase which seems to execute one unnecessary iteration. What might be a possible reason for using do-while in this instance, and what could be an alternative solution?
- The loop is used for input validation.
- The loop is intended to run until a specific condition is met.
- The loop is used for counting items in an array.
- The loop is intended for asynchronous operations.
A common use of do-while loops is for input validation, ensuring that a specific task is performed at least once before checking the condition. The unnecessary iteration might occur because the loop is designed to prompt the user for input before evaluating the condition. An alternative solution could be to use a while loop with the condition checked before the loop, but it wouldn't guarantee at least one execution.
Imagine you're reading a book about the history of web development. The chapter on JavaScript mentions a language that was developed almost simultaneously and competed with JavaScript in the early days. What is the name of this language?
- LiveScript
- CoffeeScript
- TypeScript
- ActionScript
In the early days of web development, there was another language called "LiveScript" that was developed almost simultaneously with JavaScript. Although they had similar names, they were different languages. Eventually, LiveScript was renamed to JavaScript.
The mechanism that allows you to use the structure of a class and alter it for use in another class is known as _________.
- Inheritance
- Polymorphism
- Encapsulation
- Abstraction
The mechanism that allows you to use the structure of a class and alter it for use in another class is known as "Inheritance." Inheritance in JavaScript is achieved through the prototype chain, where a child class can inherit properties and methods from a parent class, allowing for code reuse and extension.
What does the keyword "new" do in JavaScript?
- Creates a class
- Declares a variable
- Instantiates an object
- Defines a function
The keyword "new" in JavaScript is used to instantiate an object from a class constructor. When you use "new" followed by a class constructor, it creates a new instance of that class, allowing you to work with objects that have the properties and methods defined in the class. It doesn't create a class, declare a variable, or define a function.