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". it is be replaced by macOS to match its the format of watchOS, tvOS, and ios.

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46
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15answers
47k 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
5answers
74k views

Fastest and safest way to copy massive data from one external drive to another

I need to be able to copy about 2TB of data from an external drive (single USB external disk) to a another external drive (Drobo attached via Firewire). Finder is not an option. If it hits any ...
41
votes
13answers
46k 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 /System/Library/...
12
votes
2answers
16k views

How do you get system diagnostic files from OS X?

I am trying to debug a crashed (or hanging) app. How do I get the diagnostic files from the crash?
42
votes
11answers
3k 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? ...
15
votes
5answers
5k views

One mac, Two or more storage devices - how to divide things?

We're at a crossroads where most Macs now have space and connections to contain two storage devices. SSD are fast, low capacity and expensive - HDD are in comparison slow, huge and cheap. Both iMacs ...
32
votes
4answers
27k views

Quick Look support for non-native video files (.avi, .mkv) on Mavericks

In the past, we've been able to get codecs for DivX/XviD/MPEG4 and support for containers like AVI, MKV in Mac OS X's Quick Look feature using Perian (as per this question). As noted on the Perian ...
24
votes
2answers
9k views

How to show hidden files and folders in finder?

I have a folder that starts with a dot . but unable to display them in Finder. How can I say that for folder X Finder should also display hidden files/folders?
14
votes
6answers
27k views

Gigabytes of disk space shown as hidden space in DaisyDisk

My disk space usage doesn't add up. I should have used only about 80 gigabytes, but according to DaisyDisk about 25 gigabytes is taken up by hidden space. The mystery disk space seems to be classified ...
20
votes
9answers
12k views

Can I manually limit the %CPU used by a process?

I would like to limit the amount of CPU time dedicated to certain processes (e.g. Firefox, Safari, ...). I can't understand why such programs, even when not used (nothing loading, no animations, ...
28
votes
8answers
45k views

Can I disable auto-correction of a single word on OS X?

I'm running into an annoying issue with OS X's automatic spelling correction where the word nala gets automatically corrected to napa. I've tried adding nala to my custom dictionary under ~/Library/...
148
votes
6answers
51k views

Remap “Home” and “End” to beginning and end of line

Most of my computing time is spent in Linux (with occasional time in Windows). On these platforms the Home and End keys universally jump to the beginning or end of the current line. I am gradually ...
131
votes
4answers
197k views

How can I create a symbolic link in Terminal?

What command is used to create a symbolic link/soft link?
56
votes
9answers
18k 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 ...
85
votes
13answers
90k views

How to stop OS X from writing Spotlight and Trash files to memory cards and USB sticks?

When plugging a USB stick into a Mac, OS X creates a number of hidden files on the stick, including a Spotlight index and Trash folder. Example from the terminal for a USB stick "Untitled": $ ls -a /...
97
votes
10answers
211k views

How can I mount an ext4 file system on OS X?

Is there a safe, stable application for reading from and writing to ext4 file systems on Mac OS X? If not, what's the best way to access the contents of an ext4 file system on Mac OS&...
47
votes
8answers
18k 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
15answers
36k 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 ...
57
votes
8answers
100k 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 ...
77
votes
8answers
46k views

Why is it not possible to use the “cut” command to manipulate a file in the Finder?

On OS X 10.6 (Snow Leopard), I don't seem to be able to us the "Cut" command on a file in the Finder, like you can do in Windows Explorer on Microsoft Windows. (In Windows, once you select a file and "...
26
votes
4answers
15k views

Is it possible to launch a program in a specific language?

I'm a developer, and my primary language is French, so I use Mac OS X in French. However, I need on a regular basis to open an application in English to do support. Right now I'm going to the ...
29
votes
4answers
26k views

Copy and Cut sometimes don't work [closed]

My system is kept fully up to date and I still see this problem intermittently, although not as often as I used to; I would say that this has not been fully fixed. If there are any workarounds other ...
48
votes
6answers
7k 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?
32
votes
3answers
12k views

Yosemite auto creates multiple desktops (spaces) on main monitor

Since upgrading to Yosemite I've been having issue with OS X creating additional desktops on my main monitor for no apparent reason. I usually have 3 different desktops setup on my main monitor and ...
20
votes
9answers
28k views

Do you know a simple sound booster app for Mac?

Some videos on websites have the sound volume so low that even with all sound settings at maximum levels it's hard to listen. I'm looking for an app that would allow me to boost the Mac's volume. ...
12
votes
6answers
17k views

Unsaved Files in OS X Lion

Where do unsaved files go in Lion? I quit TextEdit without saving since I had no intention of saving, but with autosave the file still got save somewhere since when I reopen TextEdit the file I was ...
14
votes
0answers
32k views

Reclaim Delete freespace Partition after Yosemite removal [closed]

Many of you face the same issue , that you install Yosemite in a second partition and once you decided to remove Yosemite and go back to Mavericks, you are not able to claim the Freespace partition in ...
37
votes
7answers
32k 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 ...
6
votes
6answers
34k views

How Should I Correct the Owners and Permissions in an OS X User Folder?

My issue is that I've seriously busted all of the owners and permissions on my user folder and subfolders and it's causing lots of issues using lots of applications. The initial cause was that I had ...
14
votes
5answers
7k views

How can I opt out of updates for one app when using the App Store?

I have an app that has been radically changed (Skitch) and I'd prefer to not see any of the updates that the developer has made available to that app on the App Store. I'm lazy and like to use the "...
10
votes
4answers
1k views

How do I change the location of screen captures?

As a developer, I take a lot of screen captures. I often take a lot to share with StackExchange members on chat. The problem is my desktop is so cluttered with screen captures that they're now ...
7
votes
5answers
20k views

How to reset $PATH?

I was trying to add something to $PATH and it went totally wrong. I now can't run any commands such as ls. I've looked at this answer and used the following lines: PATH=/usr/bin:/bin:/usr/sbin:/...
3
votes
4answers
1k views

What techniques for disk, volume and file system management are possible with OS X, but troublesome within Disk Utility?

In the past, Disk Utility was the best starting point for the vast majority of disk-related tasks. As technologies within (or possible with) OS X have developed – without equal development of Disk ...
17
votes
10answers
53k views

Is there a way to password protect individual apps?

Is it possible to password protect a specific Mac application? For example, I am interested in protecting Mail because even if you cannot retrieve new emails, you still can read all the already ...
9
votes
4answers
5k views

How to launch a GUI application in another user's graphical session?

I'm trying to figure out how to launch a GUI application as another user that's logged in interactively, in that user's graphical session. For example, say I have two users, foo and bar. Both are ...
6
votes
3answers
8k views

Java - version 1.7.45 - and Mavericks

Chrome refused to run a java app unless i upgraded to .45, which I did my dling the installer from oracle. Java 7 u45. Installer said it worked. Chrome still won't start java. $ which java /usr/...
18
votes
3answers
17k views

Is there a user font for San Francisco in El Capitan?

I thought the new Apple font was called San Francisco, but I cannot find it in the font list of the Keynote.app for my Mac. Is it called another way or it is not available for Keynote? I am currently ...
14
votes
1answer
6k views

What does it mean when a %CPU exceeds (# of cores) x 100%?

Several responses to a question I asked earlier suggested I try Opera kiosk mode, so I decided to download it and give it a try. Once the download had completed and the disk image was being verified, ...
2
votes
3answers
355 views

Any recommendations for a before&after software installation scanner/uninstaller?

I'm trying to decide on an uninstaller that does before and after system scans. So far, I've come across these three: CleanApp (syniumsoftware.com/cleanapp/) - which I saw someone recommend in this ...
1
vote
1answer
780 views

What is an efficient way for developers / power users to use OSX window management and Spaces on a single screen?

This may be a strange question. Background: I usually work in a multiple monitor setup, where I can plaster the screen with all my windows so nothing I might need to switch to is ever hidden from ...
52
votes
36answers
16k views

What are your favorite Mac OS X keyboard shortcuts?

What are your favorite keyboard shortcuts on Mac OS X?
205
votes
7answers
106k views

Make the green full screen window icon on Yosemite maximize windows

On Mac OS X Yosemite the green icon in every window: is by default used to make the application full screen. How do I make it work the same way as in previous versions of Mac OS X, i.e. to ...
14
votes
4answers
25k views

Why is my Macbook Pro getting so slow?

On my MacBook Pro (Year 2009) it takes a long time until I'm logged in or until when a program is started. From day to dayit's getting slower. Programs like Safari or Word or MonoDevelop take up to 2 ...
74
votes
15answers
71k views

runaway distnoted process

Sometimes I see a distnoted process suddenly spin up and chew up 100% CPU (on one core) and a ton of memory, often in the neighborhood of 1.5G or so. This happens a few times a day, starting a month ...
12
votes
4answers
28k views

Discoveryd Alternative to Replace mDNSResponder Argument?

This is a direct follow-on to this question. Before Yosemite, I'd add the "-AlwaysAppendSearchDomains" argument to the mDNSResponder plist file so that all local resolver lookups added the search ...
42
votes
3answers
25k views

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

The different columns in Activity Monitor are a little confusing
30
votes
15answers
22k views

Lock Screen Command One-Liner

I'm trying to find out whether there is any kind of equivalent command line one-liner which replicates the exact identical functionality of the 'Lock Screen' menu option available via the Keychain app ...
47
votes
2answers
77k views

Why doesn't Mac OS X source ~/.bashrc? [duplicate]

I found a lot of people figuring out why instruction similar to this : Put X to your ~/.bashrc and you can do Y don't work. It always turns out that Mac OS X's bash's startup files (or Mac's ...
21
votes
3answers
31k views

What steps are needed to create a new user from the command line?

What commands (or script) can create a fully functional user account on Mountain Lion, running only from the command line via terminal or ssh. It looks like an existing pair of answers might work, ...
17
votes
5answers
7k views

Switch between full-screen windows of the same application in Lion

Is there a keyboard shortcut in Lion for navigating through my open full screen Xcode projects? ⌘~ is not working.