OK, I'll first X-part of the XY-problem.. you continuously copying values around between variables and then overwriting them again :-)

$cname = $name = $_ ;   # copies $_ into $name and $cname
$name =~ s/\s//g;       # removes the spaces from $name
$name = $pwd = $_ ;     # copies $_ into $name and $pwd
$pwd =~ tr ....         # transliterates $pwd
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The right code for what I guess you want would be:

$name = $pwd = $_;      # copy line into $name and $pwd
$pwd =~ s/\s//g;        # remove spaces from $pwd
$pwd =~ tr ....         # transliterate $pwd
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Now the Y-part.. what are you really trying to do? It look like you're generating passwords or serial numbers from the user's name. If so, then you should really look into using a hashing algorithm. There are plenty of modules available to do this, such as Digest::MD5 or Digest::SHA1.

Update, since it's not trivial how to use MD5 to make a 6-digit number, here's an example:

use strict;
use warnings;
use Digest::MD5 qw(md5);

my $name = "Fred Flintstone";
my $key = substr unpack("I", md5 $name), -6;

print "Name: $name\n";
print "Key:  $key\n";
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Hope this helps