exists (3) - Linux Manuals
exists: Shortcut version of file_exists() for normal files. Allegro game programming library.
Command to display exists
manual in Linux: $ man 3 exists
NAME
exists - Shortcut version of file_exists() for normal files. Allegro game programming library.
SYNOPSIS
#include <allegro.h>
int exists(const char *filename);
DESCRIPTION
Shortcut version of file_exists(), which checks for normal files, which
may have the archive or read-only bits set, but are not hidden,
directories, system files, etc.
RETURN VALUE
Returns non-zero if the file exists, or zero if it doesn't.