$filename = "/wek/hep/bin/defaults$ENV{APPL_ENV}.import";

[download]
or 
$filename =~ s/\./$ENV{APPL_ENV}./;

[download]
also see "Quote-and-Quote-like-Operators" part in perlop

In reply to Re: Help? Please! Quick! by ccn
in thread Basic String Substitution by captcrash

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