sips - image manipulation

sips -z <height> <width> <image> resizes the specified image, ignoring the previous aspect ratio.

sips -Z <size> <image> resizes the largest side of the specified image, preserving the aspect ratio.

sips -c <height> <width> <image> crops the specified image to the given dimensions (relative to the center of the original image).

sips -r <degrees> <image> rotates the image by the specified degrees.

By default, sips will destructively overwrite the input image. Use the -o flag to specify a different output file path (which must have the same file extension as the input image).

textutil - document file converter

textutil can convert files to and from Microsoft Word, plain text, rich text, and HTML formats.

textutil -convert html journal.doc converts journal.doc into journal.html.

The possible values for -convert are: txt, html, rtf, rtfd, doc, docx.

pmset - configure power management

pmset -g prints all available power configuration information.

pmset -g assertions displays information about power-related assertions made by other processes. This can be useful for finding a process that is preventing your Mac from going to sleep.

pmset -g thermlog displays information about any processes that have been throttled (useful when running benchmarks).

pmset displaysleepnow immediately puts the display to sleep without putting the rest of the system to sleep.

pmset sleepnow immediately puts the entire system to sleep.

SIP 是什么？

这东西全称 System Integrity Protection，译为系统完整性保护

SIP 是 OS X El Capitan 时开始采用的一项安全技术，目的是为了限制 root 账户对系统的完全控制权，也叫 Rootless 保护机制。从文档看出，苹果自家的 Xcode 系统是做了特殊处理的，但第三方软件需要经过 SIP 的检查。

简而言之 SIP 会在我们跑任软件之前，把你的执行文件做一个校验和，然后通过网络请求发送到让人敬畏的苹果服务器，就是为了检测是否是恶意软件！

如果你想关闭 SIP，还有那么点麻烦：

  • 重启 Mac，按住 Command + R 直到屏幕上出现苹果的标志和进度条，进入 Recovery 模式。(如果是新的 Mac 就在启动的时候长按住电源键)
  • 在屏幕上方的工具栏找到并打开终端，输入命令 csrutil disable ；
  • 关掉终端，重启 Mac；
  • 重启以后可以在终端中查看状态确认。
一个读者指出了更简单的办法，把你信任的工具加入到 Developer Tools(必须通过 UI 设置)

Setting ==> Privacy & Security ==> Developer Tools