#include <stdio.h>

char *ls = "ls";

main()
{
	FILE *inpipe, *popen();
	char buf[BUFSIZ];

	inpipe = popen(ls, "r");
	while (fgets(buf, sizeof buf, inpipe) != NULL) {
		buf[strlen(buf)-1] = ' ';
		fputs(buf, stdout);
	}
	printf("\n");
	pclose( inpipe );

	exit(0);
}