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Write a C program that implements a shell. The shell program should operate in the following basic way: when you type in a command (in response to its prompt), the shell creates a child process that executes the command you entered and then prompts for more user input when it has finished.
The shell program is essentially a loop that performs the following steps: 1. Print the command prompt. 2. Read the command line (e.g, "ls -a -l"). 3. Parse the command line into tokens consisting of the executable file name ("ls") and its arguments ("-a" and "-l"). 4. Fork a child process, which executes the command. 5. Wait for the child to terminate. When parsing the command line, store the tokens in an argument vector, say argvec[], which is an array of pointers to strings. For example, if the command line is "ls -a -l" then: argvec[0] = "ls", argvec[1] = "-a", and argvec[2] = "-l". Make sure to terminate the array of pointers by a NULL pointer - i.e.: argvec[3] = NULL. After parsing the command, fork a child process that will then perform an execvp() to execute the command. Pass the argument vector that you built as an argument to function execvp() In shells (such as tcsh or bash) the history command is a builtin shell command - it is implemented within the shell itself and does not correspond to a separate system program. Enhance your shell program by adding a history feature. Number the commands in the history list according to its order of occurrence since the beginning when your shell program was invoked. 1. Your C source code 2. A makefile for source code 3. A README file describing program
Why does motherboard sometimes support more than one system bus speed? So that it can support different processors running at different speeds.
Write and explain three recent laws dealing with computer crimes.
Initialize the array so that the first 25 elements of array are equal to the square of the index variable, and the last 25 elements are equal to three times the index variable. Output the array so that 10 elements per line are printed on the conso..
What is the sum after the following loop terminates
identifies the cost of computer components to configure a computer system (including all peripheral devices where needed) for use in one of the following four situations:
Explain how concepts such as RISC, pipelining, cache memory, and virtual memory have evolved over the past twenty-five years to improve system performance.
Write down a 2-3 page paper explaining the hardware and software utilized to support personal, workgroup, and enterprise computing in the present organization.
To perform queries on a relational database system using SQL? To demonstrate an advanced knowledge of stored procedures, stored functions and triggers.
Write a program to calculate Net Pay and Totals from the inputs provided below. The program should use a loop & prompt user for inputs shown.
Write a procedure named WriteScaled that outputs a decimal ASCII number with an implied decimal point.
Classify each of the following occurrences as an incident or disaster. If an occurrence is a disaster, determine whether or not business continuity plans would be called into play.
Create two constructors (default and initialization), accessor (get/set) methods, a printInfo method, a toString method, a method deposit that will increase the balance by a specified amount returning nothing.
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