I opened/man git/, where I found a command/git-send-email/. So I did/git send-email/, that returns "git: 'send-email' is not a git command. See 'git --help'". Then I try/man git-send-email/, that returns "No manual entry for git-send-email". So, I used/git --help/ that says nothing about/git-send-email/. After some searchs, I found that I had to install git-email. The problem is that the message "git: 'send-email' is not a git command" is not clear, because in the man pages it is listed. Something like "git: 'send-email' is not installed" will be clear and won't beconfusing. I am sorry if this is not the good email list for a bug of this type. I was using Debian GNU/Linux 7 amd64 stable. Thanks.