tai64n 1 user commands djbwares tai64n puts a precise timestamp on each line. tai64n tai64n reads lines from stdin. For each line, it writes an @, a precise timestamp, a space, and 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 used by tai64n are 12-byte TAI64N labels in external TAI64N format, printed as 24 lowercase hexadecimal characters. You can use tai64nlocal1 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 gettimeofday3 library routine to return the current time as the number of TAI seconds since 1970-01-01 00:00:10 TAI. Because it does, this implementation only has a resolution of microseconds, adding 500 nanoseconds to each UNIX time that it obtains so that every timestamp is halfway through a microsecond. Beware that most gettimeofday() implementations are not Y2038-compliant. Furthermore, most clocks are not set accurately. 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. supervise1 svc1 svok1 svstat1 svscanboot1 svscan1 readproctitle1 fghack1 pgrphack1 multilog1 tai64nlocal1 setuidgid1 envuidgid1 envdir1 softlimit1 setlock1 Original code and documentation by Daniel J. Bernstein. Converted to manual pages and updated by Gerrit Pape in 2000, 2001, and 2002. Converted to DocBook XML by Jonathan de Boyne Pollard.