Question

This project consists of designing a C program to serve as a shell interface that accepts user command and then executes each command in a separate process. Your implementation will support input an output redirection, as well as pipes as a form of IPC between a pair of commands. Completing thi project will involve using the UNIX fork(), exec(), wait(), dup2(), and pipe() system calls and can b completed on Linux system. I. Overview A shell interface gives the user a prompt, after which the next command is entered. The example belov illustrates the prompt osh> and the user's next command: cat prog.c. (This command displays the fil prog.c on the terminal using the UNIX cat command.) osh>cat prog.c One technique for implementing a shell interface is to have the parent process first read what the use enters on the command line (in this case, cat prog.c) and then create a separate child process tha performs the command. Unless otherwise specified, the parent process waits for the child to exit befor continuing. However, UNIX shells typically also allow the child process to run in the background, o concurrently. To accomplish this, we add an ampersand (&) at the end of the command. Thus, if w rewrite the above command as osh>cat prog.c & the parent and child processes will run concurrently The separate child process is created using the fork() system call, and the user's command is executed using one of the system calls in the exec() family.

          This project consists of designing a C program to serve as a shell interface that accepts user command
and then executes each command in a separate process. Your implementation will support input an
output redirection, as well as pipes as a form of IPC between a pair of commands. Completing thi
project will involve using the UNIX fork(), exec(), wait(), dup2(), and pipe() system calls and can b
completed on Linux system.
I. Overview
A shell interface gives the user a prompt, after which the next command is entered. The example belov
illustrates the prompt osh> and the user's next command: cat prog.c. (This command displays the fil
prog.c on the terminal using the UNIX cat command.)
osh>cat prog.c
One technique for implementing a shell interface is to have the parent process first read what the use
enters on the command line (in this case, cat prog.c) and then create a separate child process tha
performs the command. Unless otherwise specified, the parent process waits for the child to exit befor
continuing. However, UNIX shells typically also allow the child process to run in the background, o
concurrently. To accomplish this, we add an ampersand (&) at the end of the command. Thus, if w
rewrite the above command as
osh>cat prog.c &
the parent and child processes will run concurrently
The separate child process is created using the fork() system call, and the user's command is
executed using one of the system calls in the exec() family.

This project consists of designing a C program to serve as a shell interface that accepts user command
and then executes each command in a separate process. Your implementation will support input an
output redirection, as well as pipes as a form of IPC between a pair of commands. Completing thi
project will involve using the UNIX fork(), exec(), wait(), dup2(), and pipe() system calls and can b
completed on Linux system.
I. Overview
A shell interface gives the user a prompt, after which the next command is entered. The example belov
illustrates the prompt osh> and the user's next command: cat prog.c. (This command displays the fil
prog.c on the terminal using the UNIX cat command.)
osh>cat prog.c
One technique for implementing a shell interface is to have the parent process first read what the use
enters on the command line (in this case, cat prog.c) and then create a separate child process tha
performs the command. Unless otherwise specified, the parent process waits for the child to exit befor
continuing. However, UNIX shells typically also allow the child process to run in the background, o
concurrently. To accomplish this, we add an ampersand ( ) at the end of the command. Thus, if w
rewrite the above command as
osh>cat prog.c
the parent and child processes will run concurrently
The separate child process is created using the fork() system call, and the user's command is
executed using one of the system calls in the exec() family.

Added by Sonya A.

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