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Question

Late submissions not accepted. Solution available after the due date. Submit your solution in a single, plain text source file named mh.c Write a program for the following man page NAME mh - displays the first 10 lines of a text file, or the entire file if there are 10 or fewer lines. SYNOPSIS my FILE DESCRIPTION Accepts the name of a FILE as a command-line argument. Then displays the top lines of the file. Shows the first 10 lines or the entire file if there are less than 10 lines in the file. Displays an appropriate error message if the file fails to open. EXAMPLES mh displays synopsis message mh textfile displays the first 10 lines of textfile. mh badfile displays an error message if badfile doesn't exist. 10-POINT SAMPLE RUN (using Cloud9) hstalica: /workspace exist cc mh.c -omh hstalica: /workspace exist /mh Usage: ./mh FILE hstalica: ~/workspace exist /mh badfile Couldn't Open File: No such file or directory hstalica: ~/workspace exist /mh textfile.txt this is a test of the program and it works hstalica: ~/workspace exist

Explanation / Answer

NOTE: Execution of the code is also available at link https://pasteboard.co/Gzj72ug.png. Let me know if you face any issues and i will revert back within 24 hours

Code:

#include <sys/types.h>

#include <sys/stat.h>

#include <fcntl.h>

#include <stdlib.h>

#include <stdio.h>

#include <unistd.h>

#define BUF_SIZE 8192

int main(int argc, char *argv[])

{

   /* variable declaration */

   int fd, i = 0, j = 0, k;

   char buffer[BUF_SIZE];

   char temp[100];

   /* checking if the arguments passed correctly */

   if(argc != 2){

       printf("Usage: %s FILE ", argv[0]);

       exit(0);

   }

   /* opening a file in read mode */

   fd = open(argv[1], O_RDONLY);

   /* if fd is -1 which means file does not exist or not referenced from correct path */

   if(fd == -1){

       printf("Couldn't open file %s: No such file or directory ", argv[1]);  

       exit(0);

   }

   /* file exists so reading the file */

   else{

       /* reading the entire file in buffer array */

       read(fd, &buffer, BUF_SIZE);

       /* iterating 10 times */

       for(i = 0 ; i < 10; i++){

           /* iterating through buffer variable and storing in temp array each line */

           for(k = 0;buffer[j] != ' ' && buffer[j] != -1; j++)

               temp[k++]=buffer[j];

           if(buffer[j] != -1){

               temp[k] = '';

               printf("%s ", temp);

           }

           else

               break;  

           j++;

       }

   }

   /* closing the file */

   close(fd);

  

   return 0;

}

Execution and output:

Unix Terminal> ./mh check

safkljfs

f;lkjasl;fjs;f

1

saf;asfsal;kfj

Unix Terminal> ./mh textfile.txt

this

is

a

test

of

the

program

and

it

works

Unix Terminal> ./mh test

line 1

line 2

line 3

line 4

line 5

line 6

line 7

line 8

line 9

line 10

Unix Terminal> ./mh testinggg
Couldn't open file testinggg: No such file or directory
Unix Terminal> ./mh
Usage: ./mh FILE

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