Recognize the command exit to mean that your shell program

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Reference no: EM132213821

Write a shell in C/C++

**Prefer this to be written in C++**

You do NOT need to be concerned with piping the output of commands to other commands or background job control

Your shell should use the fork system call and the execv system call (or one of its variants) to execute commands. The shell needs to use either wait or waitpid system calls to wait for a program to complete execution.

You should recognize the command exit to mean that your shell program should terminate by calling the exit() system call.

A very simple shell such as this needs at least the following components:

a command-line parser to figure out what the user is trying to do.

If a valid command has been entered, the shell should use fork to create a new child process, and the child process should exec the command.

Your shell will need to support file redirection. Use the same syntax as defined in the Bash shell: a single '>' implies that one needs to redirect the standard output of the program being started to the referenced file while a single '<' implies the same with standard input.

The double '>>' implies that standard output will append to an existing file rather than create a new file (similar behavior is required for the '<<' operator and standard input). You do not need to implement support for the Bash pipeline operator '|'.

Before calling exec to begin execution, the child process may have to close stdin (file desriptor 0) and/or stdout (file descriptor 0), open the corresponding file and use the dup2 system call to make it the appropriate file descriptor. Don't forget to use the close system call to close the old file descriptor.

Reference no: EM132213821

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