[git] Add line break to 'git commit -m' from the command line

In Bash/Zsh you can simply use literal line breaks inside quotes:

git commit -m 'Multi-line
commit
message'

ANSI-C quoting also works in Bash/Zsh:

git commit -m $'Multi-line\ncommit\nmessage'

You can also instruct Git to use an editor of your choice to edit the commit message. From the docs on git-commit:

The editor used to edit the commit log message will be chosen from the GIT_EDITOR environment variable, the core.editor configuration variable, the VISUAL environment variable, or the EDITOR environment variable (in that order). See git-var for details.

So to edit your message using nano, for example, you can run:

export GIT_EDITOR=nano
git commit

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