You probably mean something like
my $string =  join " -x exclude=$_" ,q(),@excludes;

[download]
You can use shell commands in back-quoted here doc, as in 
print <<`EOF`;
ls
cd /
ls
EOF

[download]

Update: join used instead of for. Why do I always correct just a half of the problem? :)

In reply to Re: hereto doc by choroba
in thread hereto doc by Anonymous Monk

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