Hmm. Just noticed that everyone so far seems to have missed this amazing typo:

if (-e !"/$home/.ssh/id_dsa.pub")
[download]

which should be:

if (! -e "/$home/.ssh/id_dsa.pub")
[download]

Otherwise, you're just checking the existance of a file named "" (undef, coerced to a string). {grin}