Swift Freight International Interview Questions and Answers

Special variables in Shell Scripting

• Special variables are predefined variables in shell scripts

• They provide information about the script and its environment

• Examples include $0 (name of the script), $1-$9 (arguments passed to the script), and $# (number of arguments)

• Other special variables include $?, $$ (process ID of the script), and $! (process ID of the last background command)

Linux architecture consists of kernel, system libraries, user space programs and file system.

• Linux architecture is based on a monolithic kernel.

• The kernel provides low-level hardware interaction and manages system resources.

• System libraries provide higher-level functionality to user space programs.

• User space programs are applications that run on top of the kernel.

• The file system organizes and stores data on the system.

• Examples of Linux distributions include Ubuntu, Debian, an...read more

Daemons are background processes that run continuously on a computer system.

• Daemons are usually started at system boot time

• They perform tasks such as handling requests from other programs or monitoring system activity

• Examples include web servers, email servers, and print spoolers

SED and AWK are Linux commands used for text processing and manipulation.

• SED stands for Stream Editor and is used for performing basic text transformations on an input stream

• AWK is a programming language used for text processing and data extraction

• SED can be used for tasks such as search and replace, inserting or deleting lines, and more

• AWK can be used for tasks such as filtering and sorting data, performing calculations, and more

• Both commands are commonly used in shell scrip...read more

ACID properties ensure database transactions are reliable. Normalization reduces data redundancy.

• ACID stands for Atomicity, Consistency, Isolation, and Durability.

• Atomicity ensures that a transaction is treated as a single unit of work.

• Consistency ensures that a transaction brings the database from one valid state to another.

• Isolation ensures that concurrent transactions do not interfere with each other.

• Durability ensures that once a transaction is committed, it will remain c...read more