The Unix Date command will display in epoch time

the command is 

    date +&quot;%s&quot;

&lt;https://linux.die.net/man/1/date&gt; 

**Edit:** Some people have observed you asked for days, so it&#39;s the result of that command divided by 86,400

**Update**: The answer previously posted here linked to a custom script that is no longer available, solely because the OP indicated that `date +&#39;%s&#39;` didn&#39;t work for him. Please see [UberAlex&#39; answer](https://stackoverflow.com/a/1094357/74939) and [cadrian&#39;s answer](https://stackoverflow.com/a/1094328/74939) for _proper_ solutions. In short:

1. For the number of _seconds_ since the Unix epoch use [`date(1)`](http://linux.die.net/man/1/date) as follows:
    
        date +&#39;%s&#39;

1. For the number of _days_ since the Unix epoch divide the result by the number of seconds in a day (mind the double parentheses!):

        echo $(($(date +%s) / 60 / 60 / 24))


Depending on the language you&#39;re using it&#39;s going to be something simple like 

    CInt(CDate(&quot;1970-1-1&quot;) - CDate(Today()))

Ironically enough, yesterday was day 40,000 if you use 1/1/1900 as &quot;day zero&quot; like many computer systems use.

I&#39;ve sometimes seen code written like this :

    public class B1
	{
	}

	public class B2
	{
		private B1 b1;

		public B1 B1
		{
			get { return b1; }
			set { b1 = value; }
		}
	}

i.e. class B2 has a property named &quot;B1&quot;, which is also of type &quot;B1&quot;. 

My gut instinct tells me this is not a good idea, but are there any technical reasons why you should avoid giving a property the same name as its class ?

(I&#39;m using .net 2.0, in case that matters).


Should a property have the same name as its type?

    Class someInterface = Class.fromName(&quot;some.package.SomeInterface&quot;);

How do I now create a new class that implements `someInterface`?

I need to create a new class, and pass it to a function that needs a `SomeInterface` as an argument.

Java Reflection: Create an implementing class

How to get the current date value in epoch i.e., number of days elapsed since 1970-1-1. I need solution in unix shell script.

Get Current date in epoch from Unix shell script

<p>How to get the current date value in epoch i.e., number of days elapsed since 1970-1-1. I need solution in unix shell script.</p>


I&#39;ve been stuck on a little unix command line problem.

I have a website folder (4gb) I need to grab a copy of, but just the .php, .html, .js and .css files (which is only a couple hundred kb). 

I&#39;m thinking ideally, there is a way to zip or tar a whole folder but only grabbing certain file extensions, while retaining subfolder structures. Is this possible and if so, how?

I did try doing a whole zip, then going through and excluding certain files but it seemed a bit excessive.

I&#39;m kinda new to unix.

Any ideas would be greatly appreciated.

how do I zip a whole folder tree in unix, but only certain files?

Since `ldd` lists only the dynamic libraries, is there a way to extract the information about the static libraries used to create the executable?

Get list of static libraries used in an executable

In every example and discussion I run across in the context of BSD socket programming, it seems that the recommended way to set a file descriptor to nonblocking I/O mode is using the `O_NONBLOCK` flag to `fcntl()`, e.g.

    int flags = fcntl(fd, F_GETFL, 0);
    fcntl(fd, F_SETFL, flags | O_NONBLOCK);

I&#39;ve been doing network programming in UNIX for over ten years, and have always used the `FIONBIO ioctl()` call to do this:

    int opt = 1;
    ioctl(fd, FIONBIO, &amp;opt);

Never really gave much thought to why.  Just learned it that way.  

Does anyone have any commentary on the possible respective merits of one or the other?  I imagine the portability locus differs somewhat, but do not know to what extent as `ioctl_list(2)` doesn&#39;t speak to that aspect of individual `ioctl` methods.  

UNIX nonblocking I/O: O_NONBLOCK vs. FIONBIO

Borderline ServerFault question, but I&#39;m *programming* some shell scripts, so I&#39;m trying here first :)

Most *nixes have a command that will let you pipe/redirect output to the local clipboard/pasteboard, and retrieve from same.  On OS X these commands are

	pbcopy, pbpaste	

Is there anyway to replicate this functionality while SSHed into another server?  That is, 

1. I&#39;m using Computer A.  
2. I open a terminal window
3. I SSH to Computer B
4. I run a command on Computer B
5. The output of Computer B is redirected or automatically copied to Computer A&#39;s clipboard.

And yes, I know I could just (shudder) use my mouse to select the text from the command, but I&#39;ve gotten so used to the workflow of pipping output directly to the clipboard that I want the same for my remote sessions. 

Code is useful, but general approaches are appreciated as well.

How to send data to local clipboard from a remote SSH session


In general, what can we take for granted when we append to a file in UNIX from multiple processes?  Is it possible to lose data (one process overwriting the other&#39;s changes)?  Is it possible for data to get mangled?  (For example, each process is appending one line per append to a log file, is it possible that two lines get mangled?)  If the append is not atomic in the above sense, then what&#39;s the best way of ensuring mutual exclusion?

Is file append atomic in UNIX?

I have a few directories and sub-directories containing files with no file extension. I want to add `.jpg` to all the files contained within these directories. I&#39;ve seen bash scripts for changing the file extension but not for just adding one. It also needs to be recursive, can someone help please?


recursively add file extension to all files

For my debugging needs, `pdb` is pretty good. However, it would be *much* cooler (and helpful) if I could go into `ipython`. Is this thing possible?

Is it possible to go into ipython from code?

I was trying to get a list of all python and html files in a directory with the command `find Documents -name &quot;*.{py,html}&quot;`.

Then along came the man page:

&gt; Braces within the pattern (‘{}’) are not considered to be special (that is, find . -name &#39;foo{1,2}&#39; matches a file named foo{1,2}, not the files foo1 and foo2.

As this is part of a pipe-chain, I&#39;d like to be able to specify which extensions it matches at runtime (no hardcoding).  If find just can&#39;t do it, a perl one-liner (or similar) would be fine.

Edit: The answer I eventually came up with include all sorts of crap, and is a bit long as well, so I posted it as [an answer][1] to the original itch I was trying to scratch.  Feel free to hack that up if you have better solutions.

  [1]:https://stackoverflow.com/questions/1133391/code-lines-of-code-in-a-django-project/1134186#1134186

Using find to locate files that match one of multiple patterns

For instance, I have a large filesystem that is filling up faster than I expected. So I look for what&#39;s being added:

    find /rapidly_shrinking_drive/ -type f -mtime -1 -ls | less

And I find, well, lots of stuff. Thousands of files of six-seven types. I can single out a type and count them:

    find /rapidly_shrinking_drive/ -name &quot;*offender1*&quot; -mtime -1 -ls | wc -l

but what I&#39;d really like is to be able to get the total size on disk of these files:

    find /rapidly_shrinking_drive/ -name &quot;*offender1*&quot; -mtime -1 | howmuchspace

I&#39;m open to a Perl one-liner for this, if someone&#39;s got one, but I&#39;m not going to use any solution that involves a multi-line script, or File::Find.



total size of group of files selected with &#39;find&#39;

I have some long running scripts with breaks requiring input/interaction to continue but when I switch to another window I&#39;d like to be notified (by sound) that a task is complete and now awaiting input.

I would prefer to be able to play an audio clip (*.mp3, *.ogg, etc.) but wouldn&#39;t care if the only solution is to make the PC Speaker beep noise.

Any ideas? I&#39;m open to any CLI utilities I can install that play sounds that in turn I can execute when needed.

FYI: My System is running WinXP Pro.

***UPDATE:*** Doh! My Windows &gt; Control Panel &gt; Sounds &gt; Default Beep: was set to ***(none)***. Grrr...

Problem solved.



In a bash script/command how can I make a PC beep noise, or play a sound file?

How do you convert Unix [epoch time][1] into real time in C#? (Epoch beginning 1/1/1970)

[1]: http://en.wikipedia.org/wiki/Unix_time

How do you convert epoch time in C#?

The `time` module can be initialized using seconds since epoch:

    &gt;&gt;&gt; import time
    &gt;&gt;&gt; t1=time.gmtime(1284286794)
    &gt;&gt;&gt; t1
    time.struct_time(tm_year=2010, tm_mon=9, tm_mday=12, tm_hour=10, tm_min=19, 
                     tm_sec=54, tm_wday=6, tm_yday=255, tm_isdst=0)

Is there an elegant way to initialize a `datetime.datetime` object in the same way?


In Python, how do you convert seconds since epoch to a `datetime` object?

I am trying to convert a long value (*number of milliseconds elapsed from 1/1/1970 i.e. Epoch*) to time of format `h:m:s:ms`.

The long value I use as timestamp, I get from the field `timestamp` of a logging event from log4j.  

So far I&#39;ve tried the following and it fails:   
 

    logEvent.timeStamp/ (1000*60*60)
    TimeUnit.MILLISECONDS.toMinutes(logEvent.timeStamp)

but I get incorrect value:    

    1289375173771 for logEvent.timeStamp
    358159  for logEvent.timeStamp/ (1000*60*60) 
    21489586 for TimeUnit.MILLISECONDS.toMinutes(logEvent.timeStamp)

How do I go about this?

Convert timestamp in milliseconds to string formatted time in Java

I have been fighting with this for a bit now. I’m trying to convert epoch to a date object. The epoch is sent to me in UTC. Whenever you pass `new Date()` an epoch, it assumes it’s local epoch. I tried creating a UTC object, then using `setTime()` to adjust it to the proper epoch, but the only method that seems useful is `toUTCString()` and strings don’t help me. If I pass that string into a new date, it should notice that it’s UTC, but it doesn’t.

    new Date( new Date().toUTCString() ).toLocaleString()

My next attempt was to try to get the difference between local current epoch and UTC current epoch, but I wasn’t able to get that either.

    new Date( new Date().toUTCString() ).getTime() - new Date().getTime()

It’s only giving me very small differences, under 1000, which is in milliseconds.

Any suggestions?

Convert UTC Epoch to local date

I have a string with a date format such as 

    Jun 13 2003 23:11:52.454 UTC

containing millisec... which I want to convert in epoch. 
Is there an utility in Java I can use to do this conversion?



Content Type	Original Author	Original Content on Stackoverflow
Question	Krishna	View Question on Stackoverflow
Solution 1 - Unix	UberAlex	View Answer on Stackoverflow
Solution 2 - Unix	Stephan202	View Answer on Stackoverflow
Solution 3 - Unix	cadrian	View Answer on Stackoverflow
Solution 4 - Unix	Chris Doggett	View Answer on Stackoverflow
Solution 5 - Unix	mandroid	View Answer on Stackoverflow

Get Current date in epoch from Unix shell script

Unix Problem Overview

Unix Solutions

Solution 1 - Unix

Solution 2 - Unix

Solution 3 - Unix

Solution 4 - Unix

Solution 5 - Unix

Java Reflection: Create an implementing class

Should a property have the same name as its type?

Attributions