Question

C Programming

Number output lines of a text file as it prints to the terminal

Do not use fgets or fopen

It is possible to open file without fopen using SyS commands such as open and RDONLY

Example

1 Line 1

2 Line2

Answer 1

The C program to print the lines of the text file to the terminal are given as follows:

Code:

#include <stdio.h>
 
int main(int argc, char * argv[])
{
    FILE    *   fp;             // file pointer
    char    *   line = NULL;
    int         len  = 0;
 
    int cnt = 0;    
 
    if( argc < 3)
    {
        printf("Insufficient Arguments!!!\n");
        printf("Please use \"program-name file-name N\" format.\n");
        return -1;
    }
 
    // open file
    fp = fopen(argv[1],"r");
 
    // checking for file is exist or not
    if( fp == NULL )
    {
        printf("\n%s file can not be opened !!!\n",argv[1]);
        return 1;   
    }
 
    // read lines from file one by one
    while (getline(&line, &len, fp) != -1)
    {
        cnt++;
        if ( cnt > atoi(argv[2]) )
            break;
 
        printf("%s",line); fflush(stdout);
    }
     
    // close file
    fclose(fp);
 
    return 0;
}

Code in running:

So, the code prints the output of the number of the lines in the file.

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