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$ ipfs name publish img_test ?

ps: can i create directory ?

Nope, as I written above, no directory name, just the hash of it.
When you publish, you specify exactly one hash.
If you want directories, put them in the tree: example:

mkdir -p a/b/c
echo hello > a/b/c/hello.txt
ipfs add -r a
… SOMEHASH
ipfs name publish SOMEHASH

you will then find the CONTENT of a (note that the name of a will not appear anywhere): so you will find the directory b, which includes the directory c, which includes hello.txt
if you modify the content of a, just add it again, and publish the new hash.

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