OS X (formerly Mac OS X) is the marketing name for Apple's computer OS. Note the proper pronunciation is "ohh ess ten" and not "oh ess ex".

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46
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6answers
6k views

Do Macs need to be defragmented?

I don't see any application to defragment my Mac (running OS X). Is defragmenting not necessary for Mac OS X? If so, why not?
46
votes
5answers
27k views

How do I run an app in Full Screen mode on OS X Lion on my second monitor?

How do I get an app to run in Full Screen mode on OS X Lion on my second monitor? It seems to be stuck on my first monitor, and I'd like to move it.
46
votes
7answers
57k views

Is there any way to set a MacBook Pro to not sleep when you close the lid?

The most common use case I have for this is when I'm playing music over AirTunes, but don't want an open laptop laying around. Or when I'm syncing or downloading something. This isn't the same as ...
45
votes
5answers
7k views

What's the quickest way to get a graphic on the clipboard saved to disk?

I have a graphic on the clipboard on OS X. What's the quickest way to get it onto disk as a png or jpg?
45
votes
10answers
78k views

What's a good graphical SFTP utility for OS X?

I need a small graphical utility, using which I can ssh to a server and see all the files and copy and paste (drag and drop) into my local machine. I am running Snow Leopard.
45
votes
8answers
77k views

Where does the Mac store account pictures?

I took a picture to add to my account on Mac. Now I want to use it on messenger, but I can't find it. On the account config, it's too small. I need to find the original. Where are the accout ...
45
votes
8answers
17k views

Can I make a DIY Fusion Drive?

I have a Mac Mini with two drives: a 256GB SSD and a 500GB HDD. From what I've read, the new Fusion Drive does all of it's magic in software, using the Core Storage APIs. Can I get my setup to ...
45
votes
5answers
41k views

Why am I getting a “dubious ownership of file” error when Launch Agent runs my .plist file?

I have a Launch Agent configured to run a .plist file for example: /Library/LaunchAgent/foo.plist. Inside this .plist, it is set to run during LoginWindow and Aqua. When I attempt to launch my ...
44
votes
4answers
10k views

How to add characters to the press and hold character picker in OS X Lion?

In OS X Lion, there is a very useful feature for people like me who need to write in multiple languages, which pops up a small menu of additional characters when you hold down a letter. For instance, ...
44
votes
12answers
7k views

How long can I expect my system to be unusable during an upgrade to OS X Lion?

I just downloaded Lion and am pretty eager to install it, but I can use every minute I have, so I'd rather not install it now if it means my system is unusable for 30+ minutes. How long should I ...
43
votes
6answers
12k views

How can I activate buttons with just the keyboard?

Many user interface (UI) elements or dialog boxes have buttons. I would like to be able to activate a button with just the keyboard, without the mouse. How can I do this?
43
votes
4answers
88k views

How do you EXIT full screen mode in Yosemite?

OMG, I just discovered the new green button behavior in Yosemite that causes the window to go to full screen instead of maximizing it. That's fine, and I can live with option+click to get the old ...
42
votes
6answers
95k views

How to view Root directory and subdirectories in Finder?

Apparently, the Macintosh HD icon on the desktop points to the root directory but it is not showing all the contents. Some of the files and directories are the same as those which I see when I ...
41
votes
17answers
157k views

Is there a way to start the Terminal with a keyboard short cut?

Sort of like the Windows+R command in the windows world? That actually just lets you run a command but you get the idea.
40
votes
11answers
38k views

How can I figure out what's slowly eating my HD space?

Every few days I get notices on my MacBook that it's running or run out of hard drive space. Curiously, restarting the computer will enable me to recover gigabytes of space (this past time, it was ...
40
votes
2answers
11k views

Task Switcher moves to non-primary display on Mavericks

I'm running OS X Mavericks on a computer with two displays that are not mirrored. One of them is configured as the primary display using the menu bar location in Displays System Preference, ...
39
votes
5answers
38k views

How to turn off all animations on OS X

Is it possible to turn off all animations on OS X?
38
votes
8answers
21k views

How can I make auto-hide/show for the dock faster?

I really like the auto-hide feature of the dock in Mac OS X. However, the animation for the dock to reappear is just a bit too slow for me. Since this is quite annoying, I disable the feature. Is ...
38
votes
11answers
128k views

How to arrange two windows easily to left and right side?

In Windows 7, we can easily arrange two windows with these shortcuts: Option (Alt) ⌥ + ← maximizes the window to the left side of the screen, and Option (Alt) ⌥ + → maximizes the window to the right ...
38
votes
5answers
27k views

How to get rid of firewall “accept incoming connections” dialog?

I've accepted this so many times that firewall should already remember it. For example, I get it for Eclipse when starting my java programs in debugging mode ... sometimes this dialog is displayed ...
37
votes
13answers
38k views

Why would I disable swap file in Mac OS X?

I came across a thread about installing an SSD drive in MacBook Pro. Someone in the comments also recommended to disable the swap file but didn't say why: sudo launchctl unload -w ...
37
votes
10answers
2k views

Is it generally advisable to get anti-virus software for Mac OS X?

Is it worth to buy an anti-virus software for Mac OS X? I heard both opinions like "it's not possible to get a virus on Mac OS X" and "Mac OS X is also vulnerable against virus... " Which is true? ...
37
votes
5answers
12k views

How do I remove duplicate “Open With” context menu items in Finder.app?

For whatever reason, the "Open With" context menu in Finder is always listing every app four times (exactly). I've read about (and tried) rebuilding the Launch Services database to restore the ...
37
votes
3answers
32k views

Change Dock color on left/right site in OS X 10.9 Mavericks

New in OS X Mavericks, when using the famous dock on the left or right site: It has a white background now. It makes it hard to see the icons and the design is awful. Does anyone know how to change ...
36
votes
4answers
3k views

What's the dot in the centre of the red window close button for?

When I'm working with certain applications / windows in Mac OS X (I'm using 10.8, although I'm not sure that's relevant), I sometimes see a black dot in the centre of the red window close button. What ...
35
votes
12answers
193k views

How do I type the euro value sign € on a Mac?

I've tried bashing on my keyboard with the ⌥ alt/option key pressed with the ⇧ shift key pressed but I do not seem to be able to find how I can get the euro value sign. ⇧ shift+4 gives the dollar ...
35
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3answers
20k views

What's the difference between Real, Virtual, Shared, and Private Memory?

The different columns in Activity Monitor are a little confusing
34
votes
6answers
54k views

Are there keyboard shortcuts for Home, End, PageDown, and PageUp in OS X?

How do I set keyboard shortcuts for Home, End, PageDown, and PageUp on a 13" MacBook Pro? Are there default keyboard shortcuts? Or can I do it with Automator (and if so, how)? I want them to work the ...
34
votes
15answers
28k views

Computer name keeps changing OSX 10.10 (14A389)

Since I upgraded to Yosemite 10.10 (14A389) my computer name keeps changing adding a (2) and (3) and so forth. Any ideas how to fix this?
34
votes
4answers
45k views

How can I send a mail message later?

Back in the day, I remember having an e-mail program (perhaps it was Eudora?) that could schedule the sending of mail, so when composing a message, you could set some preference for when it would be ...
33
votes
6answers
24k views

Is there a keyboard shortcut to move a window from one monitor to another?

Is there a free app that I can use to move a window from one monitor to the other monitor (assuming only two monitors) via the keyboard? I shouldn't have to use the mouse at all (e.g., for selecting ...
33
votes
8answers
38k views

OS X computer name not matching what shows on terminal

My computer name in System Preferences > sharing is set to "archos" but is showing as "iphone" on the terminal. It just started doing this after I loaded Xcode for doing iPhone development. Last ...
33
votes
12answers
60k views

What's a good Windows RDP client for Mac?

I administer a number of Windows machines, and am trying to find a really good application to remote desktop in to them from my Mac. I've tried CoRD, and I really like its library approach to saved ...
33
votes
5answers
17k views

How can I modify the list of Applications under 'Open With…'?

I recently went to open an audio file, and wanted to open it in an editor instead of a player. I right-clicked it, hovered over 'Open With...' and was met with a very unsightly list. I have seen a ...
33
votes
4answers
59k views

Can I get the CPU temperature and fan speed from the command line in OS X?

Is there a command I can run from the command line in OS X to get the current CPU temperature and/or the fan speed(s)? To be more specific, I'd like to be able to get the same info available in the ...
33
votes
7answers
9k views

Restricting Command+tab options to only apps that are in the current space

Edit: The original accepted answer is no longer valid for Mavericks. I am keeping it accepted for historical reasons, but all readers using Mavericks should use and up-vote this answer. By ...
33
votes
5answers
17k views

How to set PATH for Finder-launched applications

Apps launched via Finder seem to not respect the PATH as set in .bash_profile. So when I try to run code from an IDE (Intellij) I no longer have access to programs in /usr/local/bin, which is ...
32
votes
4answers
18k views

Can I copy by highlighting and paste by middle click on Mac OS X?

I was using Linux for the last couple of years and I find it extremely useful to copy text by highlighting it as well as to paste by clicking a middle mouse button. I'm using a Mac now and I wonder ...
31
votes
14answers
26k views

Copying the current directory's path to the clipboard

What's a quick way of copying the path to the directory that's currently open in Finder? Copying that path is very easy in Linux and Windows file managers - you just need to copy it from the address ...
31
votes
5answers
19k views

What tool exists to identify the RGB value of a pixel?

I need to get the RGB for a pixel that is in an image. Under Windows this is easy but is there a way to do this on Mac OS X?
31
votes
8answers
9k views

How do I speed up new Terminal tab loading time?

How can i speed up the terminal startup in Lion? I'm not referring to the startup of the Terminal application, but to the startup terminal windows, like when i open a new tab. I don't have anything ...
31
votes
4answers
10k views

How do I silently start up my MacBook Air?

When I start up my MacBook Air, it makes a loud startup sound unless I muted the computer prior to shutting down last time. However, I cannot guarantee that I had muted the computer last time before ...
30
votes
6answers
22k views

What is wired memory?

I'm trying to figure out what is using all of the memory in my Macbook Pro running OS X Lion. I have 8 GB of memory total. When I quit all active programs except Finder and Activity Monitor, then run ...
30
votes
3answers
23k views

Was the FileMerge application removed from OS X 10.7.3?

I just updated to 10.7.3 and can no longer find the FileMerge application, which is part of the Xcode developer tools package. Did apple remove this in 10.7.3? I've checked in my developer directory, ...
30
votes
6answers
22k views

Change the mouse wheel scrolling acceleration

I am new Mac user and I don't really like the Magic Mouse so I reverted to a good old 3 button mouse with a scroll wheel. When I turn the wheel slowly, it only scrolls pixel per pixel (or per two ...
29
votes
30answers
19k views

What OS X tweaks, hacks, or modifications couldn't you live without?

What OS X tweaks or customization applications do you find indispensable? Please search before posting in order to avoid duplicate entries. You can search within this question with inquestion:this ...
29
votes
4answers
28k views

Can I code using Swift on Mavericks?

Is is possible to code using Swift on OS X Mavericks? I found the manual on iBooks but that's as far as I can get right now.
29
votes
9answers
93k views

What's a good XML viewer/editor for Mac OS X?

I use XML Editor from XMLmind for editing/viewing XML file in Mac. It's not bad, but I expect an XML editor for Mac. What options do I have including the commercial/free software?
28
votes
5answers
17k views

Can I reset Notification Centre badge counter for Messages?

The new Messages beta app (based on iChat) is stuck with one incoming message. Can I somehow reset the badge?
28
votes
7answers
18k views

Is there a way to convert audio files in Mac OS X or the command line without using iTunes?

Now, I know I can use iTunes to convert music. But it's quite a pain.. All I'm asking is: Is there anything built into OS X or UNIX for converting files? Right now I simply want to convert .mp4 to ...