Question

my ~/.gitconfig is:

[alias]
        commit = "!sh commit.sh"

However, when I type git commit, script is not called.

Is it possible, or I have to use another alias name?

Answer 1

It is NOT POSSIBLE

This is from my clone of git.git:

static int run_argv(int *argcp, const char ***argv)
{
    int done_alias = 0;

    while (1) {
        /* See if it's an internal command */
        handle_internal_command(*argcp, *argv);

        /* .. then try the external ones */
        execv_dashed_external(*argv);

        /* It could be an alias -- this works around the insanity
         * of overriding "git log" with "git show" by having
         * alias.log = show
         */
        if (done_alias || !handle_alias(argcp, argv))
            break;
        done_alias = 1;
    }

    return done_alias;
}

So its not possible. (handle_internal_command calls exit if it finds the command).

You could fix this in your sources by changing the order of the lines and making handle_alias call exit if it finds the alias.