# Broken version is at http://www.bitbin.it/q9p6o8bv

--> cat ~/.gitconfig
<snip>
# From https://git.wiki.kernel.org/index.php/Aliases#alias
[alias]
        alias = "!sh -c '[ $# = 2 ] && git config --global alias.\"$1\" \"$2\" && exit 0 || echo \"usage: git alias <new alias> <original command>\" >&2 && exit 1' -"
        amend = commit --amend -C HEAD

`--> git config alias.alias 
!sh -c '[ $# = 2 ] && git config --global alias."$1" "$2" && exit 0 || echo "usage: git alias <new alias> <original command>" >&2 && exit 1' -
`--> git alias amend "commit --amend -C HEAD"
`--> git config alias.amend 
commit --amend -C HEAD

# Success!