eval should do it, but you have to make sure that the command string gets double-quotes left and right.
an example: 
my $FTPPath = "/my/ftp/path";
my $command = 'cd $FTPPath';

my $command_new = eval "\"$command\"";
print "$command_new\n";

[download]

---- amphiplex

In reply to Re: Interpolating strings within strings by amphiplex
in thread Interpolating strings within strings by Darby

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