Questions tagged [macos]

macOS is the current marketing name for Apple's Macintosh Operating System. This OS was previously known as OS X, and Mac OS X before that (which itself succeeded the 'classic' Mac OS).

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How can I download an older version of OS X/macOS?

Sometimes it's hard to search for older / previous versions of macOS & OS X on the App Store or Apple web site since they change links to promote the newest shipping version. This is an attempt to ...
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124 votes
19 answers
105k views

How can I figure out what's slowly eating my drive 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 ...
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189 votes
6 answers
449k views

How do I disable System Integrity Protection (SIP) AKA "rootless" on macOS?

Apple has introduced System Integrity Protection, also known as "rootless", with OS X 10.11, El Capitan. I understand this is a step for general protection against malware but as a developer I need ...
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75 votes
4 answers
518k views

I don't have administrator account on my mac

On my mac I have 2 accounts and the both are normal account. So in this moment I don't have a Administrator account, only one that was in the past a administrator, but now is not. How I can have ...
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153 votes
10 answers
156k 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 Terminal. It just started doing this after I loaded Xcode for doing iPhone ...
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465 votes
15 answers
532k views

Shortcut for toggling between different windows of same app?

I opened two Google Chrome windows (because I am using multiple Gmails) and when I do the Cmd ⌘ Tab ⇥ shortcut it just shows me other applications that I opened but does not show me the other Chrome ...
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10 votes
1 answer
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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 ...
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14 votes
2 answers
12k views

OS volume shows as type 'FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF'

Yesterday, I have tried to delete an Ubuntu partition. Since, my Mac (13", MBPro mid-2014) doesn't boot. Now, I boot on Mac OS copy with an USB. i follow different subject of this forum (like this : ...
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259 votes
3 answers
177k views

What is the "rootless" feature in El Capitan, really?

I have just learned about the "Rootless" feature in El Capitan, and I am hearing things like "There is no root user", "Nothing can modify /System" and "The world will end because we can't get root". ...
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  • 8,269
18 votes
7 answers
46k views

How can I get back a system file after deleting it from my Mac?

I've deleted a system file from my Mac and need to get it back. System files can include: hidden files in the root of / - especially unix files in /private /System files /Library files /...
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59 votes
12 answers
164k views

Is it possible to use Boot Camp with Windows 10 from an external HDD?

I need to run Visual Studio on my MacBook Pro and I need Windows to do that. The easiest and well known way to install Windows on a Mac is by running the Boot Camp app on the Mac and let it do what's ...
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52 votes
2 answers
483k views

How can I get admin access to a Mac without knowing the current password?

My Father died last year and I inherited his Mac Mini. My wife has retired and we are trying to set up the mini for her use but the changes we want to make require admin access and we do not have the ...
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67 votes
8 answers
56k views

How do I write to NTFS drives in OS X?

What is the best, easiest, preferably cheapest way to make OS X write to NTFS-formatted drives in Mac OS X?
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  • 1,427
98 votes
7 answers
53k views

Isn't Inactive memory a waste of resources?

I'm looking for explanation of memory usage on my machine especially in light of the example in this screenshot below: I understand what is Free and Active means But what are the meanings of Wired ...
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39 votes
8 answers
69k views

Resizing or expanding a CoreStorage volume

I bought a new SSD with 750 GB and made two partitions: 600 GB and 150 GB. The smaller one was thought to be a Bootcamp partition one day, but to date it was just another unused partition. When I ...
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  • 517
81 votes
4 answers
97k views

How do I remap a key in macOS Sierra, e.g., Right Alt to Right Control?

I used to use Karabiner to remap Right Alt to Right Control (as an Emacs user I use Control MUCH more that Alt) but updating to Sierra broke this. Downgrading is not an option. How do I manually ...
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31 votes
6 answers
60k views

Are OS X shutdown cause and sleep cause numbers listed/explained anywhere?

The numbers in which I'm most interested -2 0 3 5 … I might add to that shortlist. What do those numbers mean; where might we find authoritative explanations? Somewhere in Apple open source, ...
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630 votes
13 answers
522k views

How to find cause of high kernel_task cpu usage?

Occasionally my machine will have a kernel_task instance max out the CPU: This can last from minutes to sometimes hours. The machine is effectively unusable in this state. Restarting doesn't help; a ...
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80 votes
5 answers
41k views

On OS X, what files are excluded by rule from a Time Machine backup?

In addition to whatever files I may choose to exclude, what files does the system exclude by rule or classification? It might make sense not to backup Trash or Caches, but I'm looking for a way to ...
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  • 217k
63 votes
12 answers
30k views

Can I create a shortcut to open a specific application on OS X?

I want to create a keyboard shortcut to i.e. open Firefox while I am working in another application. I know I can use ⌘ CMD+T when I am in Firefox to open a new tab. I haven't found a way to create ...
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5 votes
2 answers
2k views

Revert to El Capitan

I'm having major 'disagreements' with Sierra, compatibility issues with software etc, & have decided to revert to El Capitan. I have done this many times in the past, tested an OS then gone back ...
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256 votes
8 answers
737k views

How can I manually delete old backups to free space for Time Machine?

I use a Time Capsule for backup and now I want the drive to back up data from an extra Mac. But the drive is filled up with old backups from Mac 1. There simply is not enough space available for the ...
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77 votes
6 answers
23k 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, ...
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13 votes
3 answers
14k views

What is a Kernel Panic and what does it mean?

I have this report: Anonymous UUID: Removed Tue Aug 11 20:26:13 2015 *** Panic Report *** panic(cpu 2 caller 0xffffff8028bc1cde): "launchd died\nState at Last Exception:\n\n"@/SourceCache/xnu/...
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  • 131
8 votes
2 answers
93k views

Can Recovery Mode install OS X onto a blank SSD?

I want to install a new Solid State Drive (SSD) into the Mac. Can I just build in the SSD, start the MacBook in Recovery Mode and install OS X from there on? After reading a lot on the internet I ...
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330 votes
5 answers
119k views

How can I disable animation when switching desktops in Lion?

I would very much like to disable the sliding animation that occurs when switching desktops via ctrl+→/← or ctrl+[number] in Lion. This was previously accomplished in previous versions ...
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  • 3,301
180 votes
26 answers
61k views

Is there a quick way to lock my Mac?

On Windows you can hit the keys Windows+L to lock your computer if you step away. I don't want to have to remember if sleep currently asks for a password, if there is a time out where my screen isn't ...
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  • 3,185
38 votes
1 answer
32k views

What's /System/Volumes/Data?

New mac user here (Linux background). I'm running macOS Catalina (Beta5). I've noticed there are 5 volumes in my main disk container. One is mounted at /, that I understand, it's the system, another ...
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  • 567
112 votes
3 answers
257k views

Creating A Bootable USB Of Windows 8.1 On OS X?

Reasons for wanting create such a usb include: PC is unbootable and you want to prepare a bootable USB using the ISO file that you have on your external hard drive. to install Windows 8.1 on Mac ...
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  • 7,195
44 votes
5 answers
41k views

How can I run/stop/relaunch an application automatically, at boot/login/some other time?

How do you make a script or app to run or stop running automatically when the system is booted, a user logs on, at a specific time, when a disk is attached, etc.?
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27 votes
3 answers
48k views

How do you get system diagnostic files from macOS?

I am trying to debug a crashed (or hanging) app. How do I get the diagnostic files from the crash?
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  • 650
23 votes
6 answers
25k views

Constant kernel GPU panics (GPUPanic.cpp:127) on mid-2010 MacBook Pro (6,2)

Hardware is a mid 2010 MAcBook Pro 15", i7 2,66ghz, 8 GB RAM, 512 MB Video RAM. I encounter regular kernel panics for a while now, I think since upgrading to Mavericks. Usually it used to happen ...
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  • 233
31 votes
7 answers
44k views

How do I create El Capitan installer on a Catalina (or post-El Capitan) installed Mac for use on USB boot installer?

I have downloaded the El Capitan DMG file (InstallMacOSX.dmg) provided by Apple. The expanded DMG image contains the package "InstallMacOSX.pkg" which should be run to create the El Capitan ...
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  • 539
22 votes
2 answers
8k views

Data Not Backed Up, Partition Type: FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF

I was trying to install Linux on my MacBook for class when I bricked my computer, which now in an unbootable state. I made my partition too small, so I was going to delete and create a larger one. ...
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366 votes
13 answers
212k views

How can I trigger a Notification Center notification from an AppleScript or shell script?

I'd love to be able to take advantage of 10.8's Notification Center features in AppleScripts and shell scripts I write. Is there a built-in command or a third-party library I can use from either an ...
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61 votes
5 answers
284k views

MacBook Pro: How to disable discrete GPU permanently from EFI?

I'd like to disable the NVidia GTX 750M GPU on my MacBook Pro 15" (Retina, Mid 2014, Mac OS X 10.10 Yosemite). I know I can use GfxCardStatus but I read I could have a more permanent solution by ...
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  • 811
72 votes
9 answers
91k 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 ...
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  • 5,155
20 votes
9 answers
117k views

Terminal returns not found for most commands Mac OSX

I'm really new to Mac OSX and UNIX based systems. I wanted to run a few Windows games on my Mac Mini so I started installing Wine and MacPorts. I think the installs are correct, but when I type sudo ...
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22 votes
6 answers
2k views

How do I change the location of macOS screen captures?

As a developer, I take a lot of screen captures. I often take screen shots to share with Stack Exchange members in chat. The problem is my Desktop is so cluttered with screen captures that they're ...
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  • 8,269
10 votes
5 answers
11k views

Using Apple Script to Manage Sound Output Selection

I am brand new here and I have an additional clarification or need additional help for an issue from this thread - Applescript: "can't get tab group 1 of window" (El Capitan) In my ...
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420 votes
7 answers
593k views

How can I create a symbolic link in Terminal?

What command is used to create a symbolic link/soft link?
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105 votes
1 answer
219k views

How do I automate a key press in AppleScript?

Is it possible to automate the key press of a key (such as "a" or "<") in Mozilla Firefox, Google Chrome or Safari (in this order)? I'd like to automate the key press of "a" for example in Mozilla ...
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  • 1,696
10 votes
2 answers
31k views

Installing Ubuntu on Mac with macOS and Windows already installed

I have a dual-boot MacBook Pro late 2013 with macOS Sierra and Windows 10 (BOOTCAMP) already installed. I want to install Ubuntu as a third OS. Is there any (easy) way to do it? > Disk Partitions:...
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16 votes
1 answer
9k views

What and how does macOS Mojave implement to restrict applications access to personal data?

As well as many of the other features talked about during macOS Mojave's release like dark mode and the addition of new apps like Home, another key feature of macOS Mojave seems to be it's heightened ...
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  • 635
52 votes
8 answers
52k views

Possible to run scripts on sleep and wake?

MacBook Pro 2010 running OS X Lion. Is it possible to run scripts on sleep and wake events? My specific application is that I've got Dropbox-synced Truecrypt volumes that I regularly use on both my ...
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  • 695
44 votes
9 answers
79k views

How can I create or recreate a Lion recovery partition?

For whatever reason, one of our macs didn't make a recovery partition when it upgraded to Lion. Is it possible to add a recovery partition after the fact? To be clear - on a normal mac, the ...
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  • 217k
17 votes
1 answer
14k views

Block Specific Apps on macOS

Is there a way to block a list of specific apps on macOS? I have looked up solutions such as Cisdem, but there are some holes in the way it works that I don't like. Unless you also block Activity ...
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12 votes
5 answers
8k views

How to keep an SSD in shape on Yosemite?

As of OS X 10.10, Apple uses kext signing. Ever since it has become difficult and dangerous to manually activate TRIM for third-party SSDs on OS X. That means users with non-Apple SSDs will sooner or ...
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  • 7,104
598 votes
155 answers
337k views

Please share your hidden macOS features or tips and tricks

Do you know any hidden or little-known nice feature of macOS (née Mac OS X)? It doesn't matter what it is—maybe just a short terminal command or a keyboard shortcut. Share your experiences on ...
217 votes
12 answers
283k views

Why are dot underscore ._ files created, and how can I avoid them?

I am using different operating systems on different machines on different locations. I am using a USB flash disk to keep my files (source codes etc.). I am new to Mac OS X and now I realize there are ...
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