Answer to Question #315411 in C for annie

Question

 Write a program that receives one command line argument: the name  of a text file. Your program will work as follows:  

 Start out by creating a child process.  

 The child process calls exec to run cat command with command line argument that  the parent received. 

Answer 1

#include <unistd.h>
#include <sys/wait.h>
#include <stdio.h>

int main(int argc, char* argv[]) {
    pid_t pid;

    if ((pid = fork()) < 0) {
        fprintf(stderr, "Error in fork\n");
    }
    else if (pid == 0) {
        execlp("cat", "cat", argv[1], NULL);
    }
    else {
        waitpid(pid, NULL, 0);
    }

    return 0;
}