Re: [OpenIndiana-discuss] using touch ... whats wrong here

[Harry Putnam]

v...@bb-c.de (Volker A. Brandt) writes:

> Hi Harry!
>
>
>>   find scripts/perl/ -cnewer NewerThan -and ! -cnewer ButNotNewerThan
>
> Stupid question:  Which find are you using?  The -cnewer construct

gnu find


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Re: [OpenIndiana-discuss] using touch ... whats wrong here

[Harry Putnam]

Thanks for the good input... yes I see it is `-newer' I was
after... not -cnewer.


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Re: [OpenIndiana-discuss] using touch ... whats wrong here

[Peter Tribble]

On Thu, Dec 3, 2015 at 7:52 AM, Harry Putnam  wrote:

> Not particularly and OI question but that is where I need this
> technique to work.  I'm hoping some of you old shell hands will
> see the problem.
>
> I hope not to be exibiting true ignorance... but here I go.
>
> I keep messing with one forumlation of find cnmd that seems like it
> aught to work...  What am I doing wrong or not understanding?
>
> I'm trying to use finds' -c newer technique
>
> Check on just two of many files with following dates.
>
>   Two of quite a few files in this location:
>   -rwxr-xr-x 1 harry nfsu 1768 2014-07-22 20:18 scripts/perl/getad
>   -rwxr-xr-x 1 harry nfsu 6429 2014-07-22 20:18 scripts/perl/rnami.pl
>
> To my eye, those dates fall within the targetting files
>
> Now create our targeting files with target date inbetween
>
>   touch NewerThan -t 201406141130
>
>   touch ButNotNewerThan -t 201408141130
>
> Now check my targeting files:
>
>   ls -l NewerThan ButNotNewerThan
>   -rw-r--r-- 1 harry nfsu 0 2014-08-14 11:30 ButNotNewerThan
>   -rw-r--r-- 1 harry nfsu 0 2014-06-14 11:30 NewerThan
>
> Ok, now try it up
>
>   find scripts/perl/ -cnewer NewerThan -and ! -cnewer ButNotNewerThan
>
>   (Nada)
>
> Where is the flaw?
>

You're mixing the various timestamps.

A file has three timestamps:

access, shown by ls -lu
modify (of data), shown by ls -l
creation (or modify metadata), shown by ls -lc

Using find -cnewer (a gnu extension) looks at the creation time. The
creation time of the
files you're using as the comparison will be just now, so won't work. If
you want to compare
against the regular modification time (which is the time shown in your ls
output), then just
use -newer.

-- 
-Peter Tribble
http://www.petertribble.co.uk/ - http://ptribble.blogspot.com/
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Re: [OpenIndiana-discuss] using touch ... whats wrong here

[Volker A. Brandt]

Hi Harry!


>   find scripts/perl/ -cnewer NewerThan -and ! -cnewer ButNotNewerThan

Stupid question:  Which find are you using?  The -cnewer construct
is Gnu find only.  The "regular" find in /usr/bin does not understand
it.  Do you get something like "find: bad option -cnewer"?


Regards -- Volker
-- 

Volker A. Brandt   Consulting and Support for Oracle Solaris
Brandt & Brandt Computer GmbH   WWW: http://www.bb-c.de/
Am Wiesenpfad 6, 53340 Meckenheim, GERMANYEmail: v...@bb-c.de
Handelsregister: Amtsgericht Bonn, HRB 10513  Schuhgröße: 46
Geschäftsführer: Rainer J.H. Brandt und Volker A. Brandt

"When logic and proportion have fallen sloppy dead"

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Re: [OpenIndiana-discuss] using touch ... whats wrong here

[Jonathan Adams]

is there a particular reason that you can't use just "-newer" ?

On 3 December 2015 at 09:34, Volker A. Brandt  wrote:

> Hi Harry!
>
>
> >   find scripts/perl/ -cnewer NewerThan -and ! -cnewer ButNotNewerThan
>
> Stupid question:  Which find are you using?  The -cnewer construct
> is Gnu find only.  The "regular" find in /usr/bin does not understand
> it.  Do you get something like "find: bad option -cnewer"?
>
>
> Regards -- Volker
> --
> 
> Volker A. Brandt   Consulting and Support for Oracle Solaris
> Brandt & Brandt Computer GmbH   WWW: http://www.bb-c.de/
> Am Wiesenpfad 6, 53340 Meckenheim, GERMANYEmail: v...@bb-c.de
> Handelsregister: Amtsgericht Bonn, HRB 10513  Schuhgröße: 46
> Geschäftsführer: Rainer J.H. Brandt und Volker A. Brandt
>
> "When logic and proportion have fallen sloppy dead"
>
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Re: [OpenIndiana-discuss] using touch ... whats wrong here

[James Carlson]

On 12/03/15 04:56, Peter Tribble wrote:
> You're mixing the various timestamps.

Indeed; that's the problem.

> access, shown by ls -lu
> modify (of data), shown by ls -l
> creation (or modify metadata), shown by ls -lc

Perhaps a nit, but one I think is important.  UNIX (including
OpenIndiana) does not keep track of file or directory "creation" time.
The 'ctime' element tracks the last attribute change time.  There's no
way (in UNIX) of knowing when a file was created.

And, yes, the OP should be using the file's mtime (the "-newer" option).
 The attribute change time is rarely what you want.  :-/

-- 
James Carlson 42.703N 71.076W 

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Re: [OpenIndiana-discuss] using touch ... whats wrong here

[Doug Hughes]

That is the classical answer for ctime. James is correct. However some may find 
it interesting to note that GPFS does indeed keep the original creation time as 
an additional attribute that can then be used for policy applications. It is 
not exposed to Unix, but it's there. Alas, GPFS is only available on AIX and 
Linux at this time.

(misc morning info share)

Sent from my android device.

-Original Message-
From: James Carlson <carls...@workingcode.com>
To: openindiana-discuss@openindiana.org
Sent: Thu, 03 Dec 2015 8:24
Subject: Re: [OpenIndiana-discuss] using touch ... whats wrong here

On 12/03/15 04:56, Peter Tribble wrote:
> You're mixing the various timestamps.

Indeed; that's the problem.

> access, shown by ls -lu
> modify (of data), shown by ls -l
> creation (or modify metadata), shown by ls -lc

Perhaps a nit, but one I think is important.  UNIX (including
OpenIndiana) does not keep track of file or directory "creation" time.
The 'ctime' element tracks the last attribute change time.  There's no
way (in UNIX) of knowing when a file was created.

And, yes, the OP should be using the file's mtime (the "-newer" option).
 The attribute change time is rarely what you want.  :-/

-- 
James Carlson 42.703N 71.076W <carls...@workingcode.com>

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[OpenIndiana-discuss] using touch ... whats wrong here

[Harry Putnam]

Not particularly and OI question but that is where I need this
technique to work.  I'm hoping some of you old shell hands will
see the problem.

I hope not to be exibiting true ignorance... but here I go.

I keep messing with one forumlation of find cnmd that seems like it
aught to work...  What am I doing wrong or not understanding?

I'm trying to use finds' -c newer technique

Check on just two of many files with following dates.

  Two of quite a few files in this location:
  -rwxr-xr-x 1 harry nfsu 1768 2014-07-22 20:18 scripts/perl/getad
  -rwxr-xr-x 1 harry nfsu 6429 2014-07-22 20:18 scripts/perl/rnami.pl

To my eye, those dates fall within the targetting files

Now create our targeting files with target date inbetween

  touch NewerThan -t 201406141130
  
  touch ButNotNewerThan -t 201408141130

Now check my targeting files:

  ls -l NewerThan ButNotNewerThan 
  -rw-r--r-- 1 harry nfsu 0 2014-08-14 11:30 ButNotNewerThan
  -rw-r--r-- 1 harry nfsu 0 2014-06-14 11:30 NewerThan

Ok, now try it up

  find scripts/perl/ -cnewer NewerThan -and ! -cnewer ButNotNewerThan

  (Nada)

Where is the flaw?


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