The s6-tai64ndiff program
s6-tai64ndiff acts as a filter, reading from stdin and writing to stdout.
It expects every line of its input to begin with a
timestamp. It replaces this timestamp with a prefix showing the time
difference between this line and the previous line.
- s6-tai64ndiff exits 0 when it sees the end of stdin. If there's an
unfinished line, s6-tai64ndiff processes it and writes it before exiting.
- The prefix it prints is of the form [ seconds.microseconds ],
in decimal. It can be interpreted as a fixed-point decimal number of seconds that
elapsed between the timestamp on the previous line and the timestamp on the
- If the difference isn't defined, seconds and microseconds
are just whitespace. The difference is not defined on the first line of stdin or
on non-timestamped lines. Following non-timestamped lines, the difference may not
- The typical use case of s6-tai64ndiff is to read files that have
been filtered through s6-tai64n, or log files
that have been produced by s6-log with the t
- The difference is a signed number. Negative numbers probably indicate
a backwards clock jump, which is a bad thing to have on a system.