Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
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
Draw a sequence diagram for the following use case. Draw only the first five messages sent. The FieldOfficer activates the "Report Emergency" function of her terminal. The system responds by presenting a form to the officer.
write a three to five 3-5 page paper in which you describe the main compliancy requirements and the protected
Design a rotating disk where the number of bits per track is constant
To typeset documents that include titles, sections, lists, emphasis, verbatim environments, footnotes, tables of contents, and mathematical equations using LATEX
Suppose the memory cells at addresses 00 through 03 in the machine described in Appendix C contain the following bit patterns.
The goal of this project is for you to demonstrate your ability to apply the concepts
Use the example to illustrate how RSA algorithm works. Deciper following ciphertext, that was enciphered using Caesar cipher.
Compare the differences between MAC and H-MAC.
A health care issue that has been in the news lately is the computerization of health records. This probability is being approached cautiously because of sensitive privacy and security concerns, among others.
Which server type would you most likely need to deply at each physical location in a WAN?
What is not a problem associated with poor data management? a. essential data missing from the database b. inability to locate data c. system down time d. inconsistencies in representations
Q1. Write the truth table for a 1-to-2 decoder. Draw a circuit which implements a 1-to-2 decoder using AND gates, OR gates and NOT gates only.
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd