tai64n - puts a precise timestamp on each line.

tai64n reads lines from stdin. For each line, it writes

       1      an @,

       2.     a precise timestamp,

       3.     a space, and

       4.     a copy of the input line

              to stdout. The timestamp indicates the moment that tai64n read the first character of the line.

              tai64n does not allocate any memory after it starts.

tai64n exits 0 when it sees end of input. It exits 111 without an error message if it has trouble reading
       stdin or writing stdout.

       tai64n - puts a precise timestamp on each line.

supervise(8),  svc(8),  svok(8),  svstat(8),  svscanboot(8),  svscan(8),   readproctitle(8),   fghack(8),
       pgrphack(8), multilog(8), tai64nlocal(8), setuidgid(8), envuidgid(8), envdir(8), softlimit(8), setlock(8)

       http://cr.yp.to/daemontools.htmltai64n(8)

tai64n

       Timestamps  used  by  tai64n are 12-byte TAI64N labels in external TAI64N format, printed as 24 lowercase
       hexadecimal characters. You can use tai64nlocal(8) to convert the timestamps to a human-readable format.

       For  example,  the  timestamp  4000000037c219bf2ef02e94  refers  to  the  nanosecond  beginning   exactly
       935467455.787492500  seconds  after  the  beginning  of  1970 TAI; 37c219bf hexadecimal is 935467455, and
       2ef02e94 hexadecimal is 787492500.

       The current implementation of tai64n relies on the  UNIX  gettimeofday  library  routine  to  return  the
       current  time  as  the number of TAI seconds since 1970-01-01 00:00:10 TAI. Beware that most gettimeofday
       implementations are not Y2038-compliant. Furthermore, most clocks are not set accurately.