How to use popen and pclose to Filter Output Through Another Program

Source code for Filter Output Through Another Program

#include <stdio.h> #include <stdlib.h> void write_data (FILE * stream) { int i; for (i = 0; i < 100; i++) fprintf (stream, "%d\n", i); if (ferror (stream)) { fprintf (stderr, "Output to stream failed.\n"); exit (EXIT_FAILURE); } } int main (void) { FILE *output; output = popen ("more", "w"); if (!output) { fprintf (stderr, "incorrect parameters or too many files.\n"); return EXIT_FAILURE; } write_data (output); if (pclose (output) != 0) { fprintf (stderr, "Could not run more or other error.\n"); } return EXIT_SUCCESS; }

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