Debugging error

Posted on 2004-09-09
Last Modified: 2010-04-15
I have this program(Text listing) which reads from a file and display the output on the screen(unix environment).TThe program already reads from file but it does not display the whole contents of a file in a screen and also it gives me an error whichs says COMMAND NOT FOUND.What you do is that you compile the program and run it. After running it you type in the name of the file eg input.txt. And that's when the error occurs.

Here is the Program below

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#define MAXLINE 2000

int getline(char nl[], int max, FILE *fp)
   int c, i;

   i = 0;
   while(--max > 0 && (c = getc(fp)) != EOF && c != '\n')
     nl[i++] = c;
   if (c == '\n')
     nl[i++] = c;
   nl[i] = '\0';
   return i;

main(int argc, char *argv[])
    int i,found = 0;
    FILE *fp;
    char line[MAXLINE];
    int c;

    for(i = 1; i < argc; i++)
          fp = fopen(argv[i], "r");
           if(fp == NULL)
                fprintf(stderr, "can't open %s\n", argv[i]);
                }else {
             // while fgets(argv[i], MAXLINE, fp) != NULL)

  return EXIT_SUCCESS;
Question by:pkeketso
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LVL 45

Expert Comment

ID: 12013991
>After running it you type in the name of the file eg input.txt. And that's when the error occurs.

you need to give filename on the command line

program <filename>

Also, I see no line in your program which says command not found ... how are you executing your program ?
LVL 46

Accepted Solution

Sjef Bosman earned 75 total points
ID: 12014001
Sorry, didn't compile your program, but I can see some mistakes without it:

- in getline, try using max contains 1: the first loop isn't started, c has no value, result is unpredictable; I suppose that the end-conditions of the loop haven't been thoroughly checked
- you aske for only one line from each filename-parameter, there is no loop for every file calling getline
- I suspect that COMMAND NOT FOUND comes from the input you think you have to give:
>> After running it you type in the name of the file eg input.txt.
The program doesn't even read from standard input

Sjef :)
LVL 46

Expert Comment

by:Sjef Bosman
ID: 12014005
Eh, is it YOUR program?? Or are we analysing someone else's?
LVL 11

Expert Comment

ID: 12014018
the command not found you may be getting cos the directory where the executable is not in your path

you can try



also you have

printf("%s\n",argv[i]);  at the end , which just prints the arguments i.e , the input filenames


Expert Comment

ID: 12033007
To simplify your program, you can get rid of the getline function, and just read one char at a time (checking for eof), and printing it out. Then you don't have a bug when tring to show a file with very long lines.

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