$ hg init hook-di-test
$ cd hook-di-test
$ echo '[hooks]' >> .hg/hgrc
$ echo 'commit = echo inserito $HG_NODE' >> .hg/hgrc
$ cat .hg/hgrc
[hooks]
commit = echo inserito $HG_NODE
$ echo a > a
$ hg add a
$ hg commit -m "Collaudo l'hook di commit."
inserito 35ce7b98906996dea87740158ba6c3d7bcfa2448