The input line number is 1. The source line number is 1. You probably have an issue with buffering anyway doing this. The problem is that the input lines get stuck in a pipe buffer somewhere for a while, so the timestamp they get is not the time the event happened, but the time they made it out into the place where "date" runs.
Worse, it usually behaves differently to a terminal than to a logfile, because foreground processes get line-buffered and others get block-buffered. Call it a habit but I like 'conversational' names for variables over plain numbers to avoid confusion somewhere down the line.
If you 'duplicate' your commandline parameters in the beginning of the code as a kind of declaration, you could do something like:. Anyway: leave the numbers be for what they are. Next step is to test timestamp for being something you expected as "" will lead to problems further down the code. There are many ways to accomplish such depending on what the programmer likes best. Good thing you're using the ISO time format :- I'm very fond of it too as it has the most significant to the left and least to the right and sorts undisputably Operating Systems.
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Simple timestamp generation using POSIX strftime in Perl
Quick Links. Search Forums. Show Threads. Show Posts. Shell Programming and Scripting. Get timestamp with millisecond precision. Registered User. Join Date: Sep Hi All, could any body let me know. Thanks, Krupa.
Shell Programming and Scripting
I am running this small script and I am trying to attach timestamp to each line in milliseconds that should be a realtime value and not a static value for all the lines. I am expecting an output like this. Instead of in each line I should get Milliseconds value and the values should be different.
I have a python script for what I am looking for. Note that that close is mandatory, and the string there should match the command you run on line 1. See aforementioned SO answer for details. Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Including milliseconds in a Script? Ask Question. Asked 3 years, 11 months ago.
Active 3 years, 11 months ago. Viewed times. I am expecting an output like this:: ::ED. RajuBhai RajuBhai 2 2 silver badges 9 9 bronze badges. Active Oldest Votes. Alexander Batischev Alexander Batischev 1, 6 6 silver badges 16 16 bronze badges.
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Is there trivial way to do this without dropping the final three characters of the millisecond-timestamp not that dropping characters is difficult, but I would think there'd be a one-step way for such a straightforward task? As it as it converts any number it finds, you don't have to extract the specific field with the timestamps, but conversely it might also convert numbers that were not intended to be times. Learn more. Convert milliseconds timestamp to date from unix command line Ask Question.
Asked 7 years, 7 months ago. Active 11 days ago. Viewed 36k times. Active Oldest Votes. Edit2: Thx zeekvfu, fixed. Jaime Hablutzel 5, 3 3 gold badges 32 32 silver badges 49 49 bronze badges. Didn't realize the awk solution would work after seeing the output of division in scientific notation.
The date command doesn't work at all. Dividing by will round wrong. In shell, the floor integer will be the answer. So it is just a very basic ceil function? Greg Hewgill Greg Hewgill k gold badges silver badges bronze badges. Very useful for viewing csv data that has a timestamp: cat mydata. Actually I found that the "print" word was screwing up the order of the fields. Simply remove the print keyword, i.
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C library function - strftime()
In my copy of date GNU coreutils date, 8. I used your bash arithmetic with Kugelman's date invocation and got the result I needed. This script handles both seconds and milliseconds.
Home Questions Tags Users Unanswered. Asked 4 years, 1 month ago. Active 4 years, 1 month ago. Viewed 5k times.
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Feedback on Q2 Community Roadmap. Related Hot Network Questions. Question feed.Many programs log their timestamps in the form returned by the time system call, which is the number of seconds since a particular epoch.
Many systems support a wider range of timestamps, including negative timestamps that represent times before the epoch. In order to make it easier to process such log files and to produce useful reports, gawk provides the following functions for working with timestamps. Optional parameters are enclosed in square brackets [ ] :. Turn datespec into a timestamp in the same form as is returned by systime.
It is similar to the function of the same name in ISO C. The string consists of six or seven numbers representing, respectively, the full year including century, the month from 1 to 12, the day of the month from 1 to 31, the hour of the day from 0 to 23, the minute from 0 to 59, the second from 0 to 60, 54 and an optional daylight-savings flag.
The values of these numbers need not be within the ranges specified; for example, an hour of -1 means 1 hour before midnight. The origin-zero Gregorian calendar is assumed, with year 0 preceding year 1 and year -1 preceding year 0. If utc-flag is present and is either nonzero or non-null, the time is assumed to be in the UTC time zone; otherwise, the time is assumed to be in the local time zone. If the DST daylight-savings flag is positive, the time is assumed to be daylight savings time; if zero, the time is assumed to be standard time; and if negative the defaultmktime attempts to determine whether daylight savings time is in effect for the specified time.
If datespec does not contain enough elements or if the resulting time is out of range, mktime returns Format the time specified by timestamp based on the contents of the format string and return the result. Otherwise, the value is formatted for the local time zone.
The timestamp is in the same format as the value returned by the systime function. If no timestamp argument is supplied, gawk uses the current time of day as the timestamp. This format string produces output that is equivalent to that of the date utility. Return the current time as the number of seconds since the system epoch. It may be a different number on other systems. The systime function allows you to compare a timestamp from a log file with the current time of day.
For the people that suggest running external programs to get the milli seconds Point being: before picking any answer from here, please keep in mind that not all programs will run under one whole second. If you are looking for a way to display the length of time your script ran, the following will provide a not completely accurate result:.
There are lots more! But we need to keep in mind that it takes around 30 milliseconds to run. We can cut it to the scale of 2 digits fraction, and at the very beginning compute the average overhead of reading the time, and then remove it off the measurement. Here is an example:. Not adding anything revolutionary here over the accepted answer, but just to make it reusable easily for those of you whom are newer to Bash. Update: Another alternative in pure Bash that works only with Bash 4. It will definitely be faster, because no processes are forked off the main one.
See man strftime for supported options. Also see man bash to see printf syntax. I realise this does not give milliseconds since epoch, but it might still be useful as an answer for some of the cases, it all depends on what you need it for really, multiply by if you need a millisecond number :D. Simplest way would be to make a small executable from C f. Perl requires Time::Format module. Perhaps it is not the best CPAN module to use, but it gets the job done. Time::Format is generally made available with distributions.
If you want a simple shell elapsed computation, this is easy and portable, using Frank Thonig's answer :. For Alpine Linux many Docker images and possibly other minimal Linux environments, you can abuse adjtimex :.
With awk you can get the microseconds, and with head you can use the first 3 digits only. Note: Shamelessly stolen from this answer. Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. How do I get the current Unix time in milliseconds in Bash?
Ask Question. Asked 9 years, 10 months ago. Active 4 months ago. Viewed k times. Peter Mortensen 2, 5 5 gold badges 22 22 silver badges 24 24 bronze badges.