Without a code example it's hard to know why it's working the way it is instead of the way you want.
The first thing that comes to mind, is how are you executing the external program? System or backticks?
Try using backticks and assigning the results to a variable; i.e.:
my $passwd = `cat /etc/passwd`;
Note that those are backticks (`) which share the same key as the tilde (~)(at least on my keyboard, but I'm not a Mac user, so YMMV), not single quotes (').
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Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
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intervention).
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Want more info? How to link
or How to display code and escape characters
are good places to start.
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