Programming

FILE *fp = popen(" gzip -dc /somemount/somefile.gz", "r");
while(fgets(buffer, 1024, fp))
{
      some code....
}

#include <stdio.h>
#include <sys/wait.h> /* WIF.. macro */

int
main()
{
   FILE* stream;
   int   status;
   char  buffer[1024];

   stream=popen("ls DoesNotExist", "r" );
   /* TODO:  handle case stream==NULL */

   while (fgets(buffer, sizeof(buffer), stream)) {
      printf("%s", buffer);
   }

   status=pclose(stream);
   if WIFEXITED(status) {
      int ret=WEXITSTATUS(status);
      if (ret==0)
         printf("ls command was OK\n");
      else
         printf("ls command failed: returned code=%d\n", ret);
   }
   /* handle other case like signaled etc. */
}

FILE *fp;

if (( fp = popen(" gzip -dc /somemount/somefile.gz", "r")) == NULL)
{
  perror("popen");
  exit(1); // or do other stuff here...
}