RE: Grep uniqueness issue
- From: Ankur.Gupta@xxxxxxxxxxxx (Ankur Gupta)
- Date: Fri, 29 Jul 2005 21:18:38 +0530
jason_normandin@xxxxxxxxxxx <mailto:jason_normandin@xxxxxxxxxxx> wrote:
> Hey Guys
>
> I am having an odd problem using grep to ensure an array only
> contains distinct entries.
>
> I have a list similar to the following in a file (short example of a
> much longer list)
>
> support01-FastEthernet1/0
> support01-RH
> jnormandin-p370-1691-SH-Cpu-2
> jnormandin-p370-1691-SH
>
> These entries may or may not appear multiple times within that list.
>
> I am trying to create an ARRAY containing each of these entries only
> once (a distinct list). I am using a grep statement:
>
> push @pingErrorsName, $element if (! grep (/\b$element\b/,
> @pingErrorsName));
push @pingErrorsName, $element if ( ! grep { $_ eq $element }
@pingErrorsName );
or
push @pingErrorsName, $element if ( ! grep { /^$element$/ }
@pingErrorsName );
should work.. (untested though).
But this would be inefficient for large arrays.
Use hash instead.
$pingErrorsName{$element} = undef;
Retrieve the elements by
@elements = (keys %pingErrorsName);
> * Where $element contains one of the above names in the list and
> @pingErrorsName is the distinct list of elements.
>
> What I am finding is that the array will contain all of the correct
> entries except: jnormandin-p370-1691-SH. It appears as though the
> grep is matching jnormandin-p370-1691-SH to the
> jnormandin-p370-1691-SH-Cpu-2 string (as it is a substring of the
> second one).
>
> Now I am using word boudnary anchors (\b) in the grep so I am
> confused as to why this is not working.
>
> Does anyone have any ideas as to why this is occuring and how I can
> prevent it?
HTH...
--Ankur
Why did kamikaze pilots wear helmets anyways?
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