I think I now have shields down for Brazil.

Great idea, but I do not know the details of how packages are created for other distros. I've made some inroads on Cygwin packaging but nothing is ready to announce.

Good suggestion, I'll consider it for a future release. Of course I'll have to change the name too

I like short options but there are other considerations.
Like df and du, dtt uses -h for --human-readable. So it is not available for --help.
I will not add -? because ? is a shell wildcard character. Always save your friends from unexpected shell globbing when you can.
Maybe ten percent of utilities use -V for --version. Most uses are for something else. For example, vim uses it for verbose mode.
df and du pair -a with --all. I am reserving -a for the possibility that --all will be meaningful to dtt in a future release.
df (but not du) already supports -i for --inodes, I will consider it for a future release.

dtt is designed to work like df and du in this regard. The environment variables DTT_BLOCK_SIZE, BLOCK_SIZE, and BLOCKSIZE can be used to change the reporting unit of measure. For example, DTT_BLOCK_SIZE=1024 gets you Gnu-like output.

It's a PERL script. No install needed. I just copied /usr/bin/dtt to a CentOS box to /usr/bin too.

Glad you liked it. Yes and if you manually copy the program it should support Perl interpreters all the way back to 5.6.1.

Ideally, I would learn to package for CentOS so a person can use whatever the native package installer tools are, and get software updates. Presumably there's a third party software repository where the package could be submitted. Also ideally, I would build and run tests on CentOS before packaging and distribution, in case there's any distro-specific weirdness.