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open, creat – open and possibly create a file or device
USAGE
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

int open(const char *pathname, int flags);
int open(const [...]

access – check user’s permissions for a file
USAGE
#include <unistd.h>

int access(const char *pathname, int mode);

DESCRIPTION
access() checks whether the process would be allowed to read, write or
test for [...]