I'm trying to match the whole string and not just part of it. For instance, if the needle is 2, I would like to match just the string 2 and not 20, 02, or 22 or anything related.

I'm using strstr as:

#include <stdio.h>
#include <string.h>

int main(int argc, char *argv[])
{
   FILE *file;
   char l[BUFSIZ];
   int linenumber = 1;
   char term[6] = "2";

   file = fopen(argv[1], "r");
   if(file != NULL) {
      while(fgets(l, sizeof(l), file)){
         if(strstr(l, term) != NULL) {
             printf("Search Term Found at %d!\n", linenumber);
         }
         ++linenumber;
      }
   }
   else {
      perror(argv[1]);
   }

   fclose(file);
   return 0;
}