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  1. #include <stdio.h>      /* printf */
  2. #include <stdlib.h>     /* system, NULL, EXIT_FAILURE */
  3.  
  4. void write_data (FILE * stream)
  5. {
  6.   int i;
  7.   for (i = 0; i < 100; i++)
  8.     fprintf (stream, "%d\n", i);
  9.   if (ferror (stream))
  10.     {
  11.       fprintf (stderr, "Output to stream failed.\n");
  12.       exit (EXIT_FAILURE);
  13.     }
  14. }
  15.  
  16.  
  17. int main ()
  18. {
  19.   FILE *output;
  20.   char* pPath;
  21.  
  22.   output = popen("uname -a", "w");
  23.   write_data (output);
  24.   printf("\n\n");
  25.   output = popen ("ls", "w");
  26.   write_data (output);
  27.   printf("\n\n");
  28.   output = popen ("cat /etc/passwd", "w");
  29.   write_data (output);
  30.   printf("\n\n");
  31.   pPath = getenv ("PATH");
  32.   if (pPath!=NULL)
  33.     printf ("$PATH: %s\n",pPath);
  34.   pPath = getenv ("HOME");
  35.   if (pPath!=NULL)
  36.     printf ("$HOME: %s\n",pPath);
  37.   pPath = getenv ("HOST");
  38.   if (pPath!=NULL)
  39.     printf ("$HOST: %s\n",pPath);
  40.   pPath = getenv ("SHELL");
  41.   if (pPath!=NULL)
  42.     printf ("$SHELL: %s\n",pPath);
  43.   pPath = getenv ("REMOTEHOST");
  44.   if (pPath!=NULL)
  45.     printf ("$REMOTEHOST: %s\n",pPath);
  46.   return 0;
  47. }
Success #stdin #stdout 0s 2196KB
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$PATH: /usr/local/bin:/usr/bin:/bin
$HOME: /home/EVhqWX
https://ideone.com/jwY6Hm
language:
C (gcc 8.3)
created:
9 years ago
visibility:
public

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