$ cat ~/.skel-closet/test
This is the value of HOME: #{HOME}
This is the value of EDITOR: #{EDITOR}
This is the value of FOO: #{FOO}

$ ./pskel.pl test > out.txt 
FOO unset. Value: 
foovalue

$ cat out.txt 
This is the value of HOME: /home/blj
This is the value of EDITOR: emacs
This is the value of FOO: foovalue