When I wrote unzip I wanted to allow flexibility on where it obtained it's input and where it sent its output. Currently the input and output paramers can be a filename, filehandle or in-memory.

So, for example

my $inner;
unzip "my.zip" => \$inner;

# remove all whitespace
$inner =~ s/\s+//g;

print $inner;
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This will uncompress the contents of the file "my.zip" and write the uncompressed data into the variable $inner.

The code then makes use of the uncompressed data in this case to remove all whitespace, then print it.