If you especially don't want the shell interpreting shell metacharacters, then don't pass the command to the shell, use the 4+ argument form of open.
open(CMD, '-|', '/usr/bin/ls', '$4', '$PATH');
my $output = do { local $/; <CMD> };
close CMD;
print "$output\n";
Here is the output, you'll see that the "$4" and "$PATH" were not interpreted as variables before being sent to ls.
ls: 0653-341 The file $4 does not exist.
ls: 0653-341 The file $PATH does not exist.
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Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
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<blockquote> <br /> <dd>
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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
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
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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