# tai64n(8) - man - phpMan [tai64n(8)](https://www.chedong.com/phpMan.php/man/tai64n/8/markdown) System Manager's Manual [tai64n(8)](https://www.chedong.com/phpMan.php/man/tai64n/8/markdown) ## NAME tai64n - puts a precise timestamp on each line. ## SYNOPSIS ### tai64n ## DESCRIPTION **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. ## TIMESTAMPS Timestamps used by **tai64n** are 12-byte TAI64N labels in external TAI64N format, printed as 24 lowercase hexadecimal characters. You can use [**tai64nlocal**(8)](https://www.chedong.com/phpMan.php/man/tai64nlocal/8/markdown) to convert the timestamps to a human-readable format. For example, the timestamp 4000000037c219bf2ef02e94 refers to the nanosecond beginning ex‐ actly 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 re‐ turn 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. ## EXIT CODES **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. ## SEE ALSO [supervise(8)](https://www.chedong.com/phpMan.php/man/supervise/8/markdown), [svc(8)](https://www.chedong.com/phpMan.php/man/svc/8/markdown), [svok(8)](https://www.chedong.com/phpMan.php/man/svok/8/markdown), [svstat(8)](https://www.chedong.com/phpMan.php/man/svstat/8/markdown), [svscanboot(8)](https://www.chedong.com/phpMan.php/man/svscanboot/8/markdown), [svscan(8)](https://www.chedong.com/phpMan.php/man/svscan/8/markdown), [readproctitle(8)](https://www.chedong.com/phpMan.php/man/readproctitle/8/markdown), [fghack(8)](https://www.chedong.com/phpMan.php/man/fghack/8/markdown), [pgrphack(8)](https://www.chedong.com/phpMan.php/man/pgrphack/8/markdown), [multilog(8)](https://www.chedong.com/phpMan.php/man/multilog/8/markdown), [tai64nlocal(8)](https://www.chedong.com/phpMan.php/man/tai64nlocal/8/markdown), [setuidgid(8)](https://www.chedong.com/phpMan.php/man/setuidgid/8/markdown), [envuidgid(8)](https://www.chedong.com/phpMan.php/man/envuidgid/8/markdown), [envdir(8)](https://www.chedong.com/phpMan.php/man/envdir/8/markdown), [softlimit(8)](https://www.chedong.com/phpMan.php/man/softlimit/8/markdown), [setlock(8)](https://www.chedong.com/phpMan.php/man/setlock/8/markdown) [tai64n(8)](https://www.chedong.com/phpMan.php/man/tai64n/8/markdown)