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com_err – common error display routine
USAGE
#include

void com_err (whoami, code, format, …);
const char *whoami;
long code;
[...]

closelog, openlog, syslog – send messages to the system logger
USAGE
#include <syslog.h>

void openlog(const char *ident, int option, int facility);
void syslog(int priority, const char *format, …);
void closelog(void);

[...]

atd – run jobs queued for later execution
USAGE
atd [-l load_avg] [-b batch_interval] [-d] [-s]

DESCRIPTION
atd runs jobs queued by at(1).

OPTIONS
-l Specifies a limiting load factor, over which batch jobs [...]