原來只需要，提交的時候不指定 -m ，也不指定 -F就可以了，提交之前，svn會自動彈出編輯框來，可以修改資訊。

https://stackoverflow.com/questions/17468918/svn-commit-with-a-newline-in-message

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alternatively, just do not specify -m (and not -F) and you will be shown an editor where you can type your message:

Send changes from your working copy to the repository. If you do not supply a log message with your commit by using either the --file (-F) or --message (-m) option, svn will launch your editor for you to compose a commit message. See the editor-cmd list entry in the section called “Config”.

http://svnbook.red-bean.com/en/1.7/svn.ref.svn.c.commit.html