man sips to get detailed manual.
Actually both software has been developed for many years and even today they are still advanced over modern system tools. I find them especially helpful for researcher, who quite often need to search documents and papers, and write something with repetitive phases (e.g. species name). Here comes the two tools:
Just a record of what I have installed on the Mac terminal.
My iOS App List
Gtalk (加提醒机器人很棒), Vim/Emacs (处理文本高效快速，方便写latex文档), TiddlyWiki (单网页Wiki, 记事很爽), BooguNote (全局粘贴), Total Commander (资源管理神器), Evernote (知识管理), Everything (文档搜索), Executor (快速启动), KeePass (密码管理)…