I've been trying to come up to a solution for this using the -s flag to enable me to pass an additional custom flag with the variable as a parameter to the -e code. Why can't I use something like 
perl -e -s -foo=bar 'print $foo'

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UPDATE:
Turns out I can... thanks all: 
#!/bin/ksh
var=bar
perl -se 'print $foo' -- -foo=${var}

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In reply to Re: arguments to perl -e by jcc
in thread arguments to perl -e by olecs

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