Hello Feneden, and welcome to the Monastery!

No need for the join, just replace each occurrence of one or more whitespace characters with a single character:

16:30 >perl -wE "my $s = 'Intel(R) Xeon(R) CPU          X5660  2.80GHz
+ '; $s =~ s/(\s)+/$1/g; say qq[>$s<];"
>Intel(R) Xeon(R) CPU X5660 2.80GHz <

16:33 >

[download]

Update: Looking again at the thread title, it appears you may also want to remove trailing whitespace at the end of the string:

use strict;
use warnings;

my $s = 'Intel(R) Xeon(R) CPU          X5660  2.80GHz ';
   $s =~ s{ (\s)+  }{$1}gx;
   $s =~ s{  \s+ $ }{}x;

print "\n>$s<\n";

[download]

Output:

17:26 >perl 1843_SoPW.pl

>Intel(R) Xeon(R) CPU X5660 2.80GHz<

17:26 >

[download]

Hope that helps,

Athanasius <°(((>< contra mundum Iustus alius egestas vitae, eros Piratica,

In reply to Re: Deleting intermediate whitespaces, but leaving one behind each word by Athanasius
in thread Deleting intermediate whitespaces, but leaving one behind each word by Feneden

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