JNTU B.Tech III LINUX PROGRAMMING Previous Question Paper (February - 2022 - R15)

The shell acts as a command-line interpreter that serves as the interface between the user and the Linux kernel. Its primary responsibilities include:

• Command Execution: It parses user input, locates the corresponding executable file in the system path, and initiates its execution.
• Input/Output Redirection: It manages the redirection of standard input, output, and error streams using operators like <, >, and >>.
• Piping: It connects the output of one command to the input of another using the pipe (|) operator, facilitating command chaining.
• Environment Management: It maintains and manages environment variables, aliases, and shell functions that define the user's working session.
• Programmability: It supports scripting capabilities, including variables, loops, conditional statements, and functions, allowing for the automation of complex tasks.
• Job Control: It allows users to manage multiple processes, enabling them to suspend, resume, or move processes between the foreground and background.
• Filename Expansion: It performs globbing (wildcard expansion) to match filenames before passing arguments to commands.

To calculate the net salary, we assume a base hourly rate and apply logic for overtime if hours exceed a standard threshold (e.g., 40 hours). The following awk script processes an input file containing employee names and hours worked.

#!/bin/awk -f
BEGIN {
    rate = 100;
    print "Name\tHours\tNet Salary";
    print "---------------------------";
}
{
    hours = $2;
    if (hours > 40) {
        salary = (40 * rate) + ((hours - 40) * rate * 1.5);
    } else {
        salary = hours * rate;
    }
    printf "%s\t%d\t%.2f\n", $1, hours, salary;
}

This script defines a base hourly rate of 100. For employees working more than 40 hours, it calculates overtime at 1.5 times the base rate. The script expects an input file with the format: Name Hours.