Design a Shell

I need a stripped-down shell program for UNIX. The program itself is short. The shell, not including the parser, is one and a half pages of C code. However, in order to write a shell you will need to understand the UNIX mechanisms for process creation/termination, interprocess communication, and basic file management, as well as the C system calls which are used to implement these operating system constructs. You must implement three versions of the assignment. 1st will use pipes as the inter-process communication mechanism. 2nd will use named pipes or FIFOs as the inter-process communication mechanism. Finally, 3rd will use shared memory. First are the basic functions of the standard UNIX shell: *Redirection of a command's input/output from/to a file(the use of > and < in the UNIX shell) *The use of pipes to connect the output of one command to the input of the following command on the command line (the use of | in the UNIX shell) *The execution of commands "in the background," (the use of & as a command line terminator in the UNIX shell) The second thing is that you need to use the following system calls in your shell: fork(), wait(), exit(), execvp(), close(), open(), pipe(), dup(). Third, the command line parser for the shell will be provided to you. #include "parser.c" should be the first line in the shell program. Using the above system calls and parsecmd() you should write a shell which will do the following: *Execute either a single command on a command line or two or more commands on a command line (separated by pipes). The commands may have arguments as well. *Handle the arbitrary (but syntactically correct) use of redirection of input and/or output for the commands (together with the possible use of pipes) *Check for correct use of < , > and | in the command line. Time of when this program is needed to be done is by Monday, March 3 around 12 noon. For any further questions or information, email my account.

## Deliverables

1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Installation package that will install the software (in ready-to-run condition) on the platform(s) specified in this bid request. 3) Complete ownership and distribution copyrights to all work purchased. 4) Completed by Monday March 3 around 12 noon.

## Platform

Must run on a pc system. Must be able to run on Unix.

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Näytä lisää: single system design, programming constructs, program for package design, process of package design, package used in the design, operating system programming, inter design, functions of package design, command line programming, basic programming commands, close my account, program for design, the design should have three versions, standard operating, pipes, email parser, do my assignment programming, design a two, management communication assignment, management assignment questions

Tietoa työnantajasta:
( 0 arvostelua ) United States

Projektin tunnus: #2912141

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$15 USD 14 päivässä
(10 Arvostelua)