or download this
$ perl -wE 'use Digest::SHA "sha256_hex"; say sha256_hex("joe.smith@ao
+l.com")'
Possible unintended interpolation of @aol in string at -e line 1.
...
Possible unintended interpolation of @aol in string at -e line 1.
Global symbol "@aol" requires explicit package name (did you forget to
+ declare "my @aol"?) at -e line 1.
Execution of -e aborted due to compilation errors.