pipe1.c

C Pipe example under Linux

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

int main(int argc, char *argv[])
{
  if (argc < 2) {
    printf("usage: pipe1 host\n");    
  } else {
    
    char *a,*p;
    FILE *f;
    
    p = malloc(sizeof(char) * (8 + strlen(argv[1])));
    strcpy(p,"finger @");
    strcat(p,argv[1]);
    
    f = popen(p,"r");
    a = malloc(128*sizeof(char));
    while (fread(a,1,128,f)) {
      printf("%s",a);    
    }
    pclose(f);
    free(p);
  }
  return 0;
}