It might not be directly relevant to your question (I'm not sure), but check out this old node of mine:
shloop -- execute shell command on a list. If nothing else, it might give you some ideas about how to do whatever it is you actually want to do.
As for what you've posted, if you put the content of your __DATA__ block into an disk file, e.g. call it "foo.sh", then do system( "foo.sh" ) or maybe system( "/bin/sh", "foo.sh" ) then the subshell run by the system call would read the shell script from that file, and run it.
If the idea is to use perl to change some string in the shell script and then run it, then the trick I used in shloop might help you: open up a pipeline file handle that runs a shell, and then print shell commands to it:
open( SH, "|-", "/bin/sh" ) or die "can't launch a shell: $!\n";
my $param = "whatever";
print SH "echo hello\n";
print SH "echo $param\n";
print SH "echo hi\n";
close SH;
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