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#include "apue.h"
#include <sys/wait.h>
#define PAGER "${PAGER:-more}" /* environment variable, or default */
main(int argc, char *argv[])
char line[MAXLINE];
FILE *fpin, *fpout;
if (argc != 2)
err_quit("usage: a.out <pathname>");
if ((fpin = fopen(argv[1], "r")) == NULL)
err_sys("can't open %s", argv[1]);
if ((fpout = popen(PAGER, "w")) == NULL)
err_sys("popen error");
/* copy argv[1] to pager */
while (fgets(line, MAXLINE, fpin) != NULL) {
if (fputs(line, fpout) == EOF)
err_sys("fputs error to pipe");
if (ferror(fpin))
err_sys("fgets error");
if (pclose(fpout) == -1)
err_sys("pclose error");
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