The mdfind database should stay up to date in the background, but you can also troubleshoot it as well as Spotlight using mdutil.
How to Batch Convert Images in Preview
If Spotlight isn't working the way it should, mdutil -E will erase the index and rebuild it from scratch. You can also turn off indexing entirely with mdutil -i off. It's similar to Grab. Here are just a few different ways you can use screencapture :.
Shell tricks: the OS X open command - comnartsagycum.cf
Capture the contents of the screen, including the cursor, and attach the resulting image named 'image. Select a window using your mouse, then capture its contents without the window's drop shadow and copy the image to the clipboard:. Capture the screen after a delay of 10 seconds and then open the new image in Preview:. Select a portion of the screen with your mouse, capture its contents, and save the image as a pdf:.
With launch daemons and launch agents, you can control the services that start up when you boot your computer. You can even set up scripts to run periodically or at timed intervals in the background, similar to cron jobs on Linux. For example, if you'd like to have the Apache web server start automatically when you turn on your Mac, simply type:.
Running launchctl list will show you what launch scripts are currently loaded. To see what goes into a launch agent or daemon, there's a great blog post by Paul Annesley that walks you through the file format.
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- Shell tricks: the OS X open command.
And if you'd like to learn how to write your own launchd scripts, Apple provides some helpful documentation on their Developer site. There's also the fantastic Lingon app if you'd prefer to avoid the command line entirely.
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Without any options, say will simply speak whatever text you give it out loud :. You can also use say to speak the contents of a text file with the -f flag, and you can store the resulting audio clip with the -o flag:. The say command can be useful in place of console logging or alert sounds in scripts. For instance, you can set up an Automator or Hazel script to do batch file processing and then announce the task's completion with say.
But the most enjoyable use for say is rather more sinister: if you have ssh access to a friend or coworker's Mac, you can silently log into their machine and haunt them through the command line. Give 'em a Siri-ous surprise. You can set the voice and language! It can do everything its graphical cousin can, but it also has some extra capabilities—such as filling a disk with zeroes or random data. Simply type diskutil list to see the path names of disks and removable media attached to your machine, and then point the command at the volume you want to operate on.
Be careful: diskutil can permanently destroy data if it's used incorrectly.
How to Launch OS X Apps from the Command Line
Alright—this isn't technically a native command. But no OS X power user should be without Homebrew. The website calls it "The missing package manager for OS X," and that couldn't be truer. If you've ever used apt-get in Linux, you will feel right at home in Homebrew. For instance, brew install imagemagick will set you up with ImageMagick , a powerful utility that makes it possible to do anything from whipping up animated gifs to converting images between dozens of different types.
You can have fun with Homebrew too: brew install archey will get you Archey , a cool little script for displaying your Mac's specs next to a colorful Apple logo. The selection in Homebrew is huge—and because it's so easy to create formulas , new packages are being added all the time. But the best part about Homebrew? That means you can install newer versions of system software, such as python and mysql , without interfering with the built-in equivalents.
And if you ever want to get rid of your Homebrew installation, it's easy to remove using the uninstall script.
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The -n option will actually open a new sometimes second instance of the application and the command line tool will resume when you quit this new instance. This a somewhat awkward workflow for Mac users. Many text editors provide a command line tool that may work better in these cases. If you are working on a file in Terminal and want to locate it in Finder, open can do better than just opening the enclosing folder.
It can select a given file as well:. Will open a Finder window with the enclosing folder of helloworld. You can pass multiple files into open -R but it will only select the last file in the list. For the sake of being complete: you can also open header files quickly with open.
The -h option will search and open the header file for a given class. There is an additional -s option to choose an SDK:.
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