Articles taggués ‘Mac OS X’

Fixing Mac OSX File Permissions and ACLs From the Command Line

03/06/2020 Aucun commentaire

Recently the hard drive in my mac mini running Mac OSX Leopard (10.5) failed. Luckily I had time machine backing it up to an external USB disk. Now, since I had to replace the drive and rebuild my system anyway I figured, why not upgrade to Snow Leopard? Planning to just pull what I needed off the backup drive manually I went ahead with the upgrade. There aren’t too many files on this machine that I depend on. Just some ssh keys, gpg keys and random documents scattered about here and there. So I upgraded, installed my apps and copied my files from the backup. Everything was going smoothly until I tried to actually write to one of the files I copied from the backup drive. This is when I started getting permission errors.

Here’s what happened when I tried to update my ssh known_hosts file:

airbag:~ keith$ echo foo > .ssh/known_hosts 
-bash: .ssh/known_hosts: Permission denied

Huh? But I own this file…dont I?

airbag:~ keith$ id
uid=501(keith) gid=20(staff) groups=20(staff),402(,204(_developer),100(_lpoperator),98(_lpadmin),81(_appserveradm),80(admin),79(_appserverusr),61(localaccounts),12(everyone),401(

airbag:~ keith$ ls -al .ssh/known_hosts 
-rw-r--r--@ 1 keith 502 56140 Mar 25 2009 .ssh/known_hosts
I do own it… And so began much head scratching and man page reading.

Well, as it turns out I forgot to look at the file ACLs…

airbag:~ keith$ ls -le .ssh/known_hosts 
-rw-r--r--@ 1 keith 502 56140 Mar 25 2009 .ssh/known_hosts
 0: group:everyone deny write,delete,append,writeattr,writeextattr,chown

Well no wonder, the ACL is set to deny write,delete,append,writeattr,writeextattr and chown from everyone! Let’s get rid of that.

airbag:~ keith$ sudo chmod -N .ssh/known_hosts 

That ought to do it. The -N flag says get rid of all the ACL info on the file. You could also update this to be just right for your user or group but I’d rather use only the standard unix permissions.

airbag:~ keith$ ls -le .ssh/known_hosts 
-rw-r--r--@ 1 keith 502 56140 Mar 25 2009 .ssh/known_hosts

Seems to have removed all ACLs from the file. I wonder if we can write to it now…

airbag:~ keith$ echo foo >> .ssh/known_hosts 
airbag:~ keith$

And there you have it, the file is writable once again. Now its time to get some real work done!

Categories: Système Tags: , , , ,

Change & Set the Default crontab Editor

01/06/2020 Aucun commentaire

Most hardcore command line users and unix geeks love vi, but I prefer nano. If you want to change your default crontab editor to nano, here’s how to do this:

For a one time edit, launch the terminal and type:

EDITOR=nano crontab -e

If you want to set nano as your default editor in general, you use this command:

export EDITOR=nano

Now when you go to edit crontab, nano will be the default editor than vi. You can test this by typing:

crontab -e

Looking beyond Mac OS X, this should work in Linux as well.

Categories: Système Tags: , , , ,

Automatically Connect to a Network Drive on Mac OS X Start Up & Login

26/05/2020 Aucun commentaire

It can be helpful to configure Mac OS X to automatically mount shared network drives, this is particularly true for those of us who regularly connect to a network drive for file sharing or backups.

Setting up automatic network drive connections in OS X is a two-step process, you must mount the drive, then you add it to your automatic login items. This should work flawlessly in most versions of OS X, but we’ll cover an alternative approach that uses Automator to mount a network drive automatically on login as well.

1) Mounting the Network Drive

If you’re already familiar with mapping a network drive in Mac OS X you can skip the first part of this and go straight to System Preferences in the second section.

  1. From the OS X desktop, pull down the “Go” menu and select “Connect to Server”
  2. Connect to the server and mount the drive you want to automatically connect to on boot
  3. Choose Guest or for a specific user check the box next to “Remember this password in my keychain” – you must select to remember the password otherwise the automatic login event can not happen without logging into the network drive

Next, you add the network drive to automatically connect on OS X by bringing it into your Login Items list.

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Categories: Réseau, Système Tags: , ,

Trashing files not going to the trash bin

25/05/2020 Aucun commentaire

Click on the item in the Finder’s sidebar with the house icon and verify that you are able to write to this folder in the Ownership & Permissions section of the Get Info window, and that it isn’t locked; if it is already set this way and you get that error, open the Terminal in the /Applications/Utilities/ folder and run the following:

mkdir ~/.Trash

If you get a message stating that the folder exists, run the following:

sudo chown $UID ~/.Trash
chmod u+rwx ~/.Trash

The first command in the second set will prompt you for your administrator password; nothing will appear in the Terminal window while it is being typed. In either case, click on the Finder icon in the Dock with the Control and Option keys pressed, and relaunch it.

Categories: Système Tags: ,

How-To Factory Reset MacBook Air and other macs with macOS

24/05/2020 Aucun commentaire

There are many reasons why you’d want to reset your MacBook Air to factory settings. Perhaps your Mac is showing just a too much little lag. Maybe you want to reset for better overall performance, are thinking of giving away or selling your MacBook after you purchase or receive the latest Mac model. For whatever reason, you need to set your Mac back to its factory defaults.


Since our Macs hold so much of our personal and private data, it’s imperative to clean out our machines when selling or giving away our favorite older Macs. And it’s particularly useful for the new user to have a nice clean machine that’s returned to its native factory state.


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