Setting up passwordless SSH logins is a great way to speed up connections to regularly accessed remote Macs and unix boxes. Because OS X doesn’t include the ssh-copy-id command, you will have to use cat or scp to copy over your ssh key. This is how to set everything up, it only takes a minute or so.

First, on the local machine you will want to generate a secure SSH key:

ssh-keygen

Walk through the key generator and set a password, the key file by default goes into ~/.ssh/id_rsa

Next, you need to copy the generated key to the remote server you want to setup passwordless logins with, this is easily done with the following command string but you can use scp if you’d prefer:

cat ~/.ssh/id_dsa.pub | ssh user@remotehost 'cat >> ~/.ssh/authorized_keys'

This command takes the generated SSH key from the local machine, connects to the remote host via SSH, and then uses cat to append the key file to the remote users authorized key list. Because this connects with SSH to the remote machine you will need to enter the password to use this command.

Finally, confirm that you can now login to the remote SSH server without a password:

ssh user@remotehost.com

Assuming initial setup went as intended, you will connect to the remote machine without having to log in. You can shorten the connection steps even further by creating an alias in bash_profile so that you are only required to type a short command to immediately connect to the specified remote server.

There are some obvious potential security risks with using ssh without a password, the best way to mitigate that is to lock down the client machine with lock screens for screen savers and sleep and boot passwords, all of which you should be utilizing anyway.

It’s a good idea to check the hard drive health of a Mac as part of a periodic maintenance routine. Doing this is extremely easy with Disk Utility, here’s how to do it and what to do if you encounter any issues:

1. Launch Disk Utility, found within the /Applications/Utilities folder
2. Select the Mac hard drive from the left side menu and click on the “First Aid” tab
3. Click on “Verify Disk” in the lower right corner and let it run

You will find the window populating with messages about the drives health, messages that indicate things are fine appear in black, messages that indicate something is wrong appears in red. For the vast majority of users it will look something like this, finalizing with a message of “The partition map appears to be OK”, indicating no errors:

Verifying partition map for “APPLE Media”
Checking prerequisites
Checking the partition list
Checking for an EFI system partition
Checking the EFI system partition’s size
Checking the EFI system partition’s file system
Checking all HFS data partition loader spaces
Checking Core Storage Physical Volume partitions
The partition map appears to be OK

If you do see a red message saying something along the lines of “Error: This disk needs to be repaired” and it’s your boot drive, you’ll find the “Repair Disk” button is inaccessible. In this case all you need to do is reboot into the Recovery HD partition and run Repair Disk from there, here’s how to do that in OS X Lion and Mountain Lion:

Before proceeding it’s a good idea to backup your drive quickly with Time Machine.

1. Reboot the Mac and hold down Command+R (hold own Option key on some Macs)
2. Select “Recovery HD” from the boot menu
3. Choose “Disk Utility” from the Mac OS X Utilities screen
4. Click the hard drive that reported the error, click the “First Aid” tab, and now click on “Repair Disk”

After Repair Disk has ran successfully, you are free to boot OS X as normal and the drives issues should be resolved.

A few final notes: relying on a hard drive being healthy is not an alternative to having backups, you need to backup your Mac with regularity using Time Machine or some other method if you choose. Hard drives fail, it’s a fact of computing life. It’s also important to note Disk Utility isn’t a 100% conclusive test suite to determine drive health, and if you hear weird sounds coming out of the hard drive it’s probably a good time to head down to Apple and prepare for a drive swap because that drive is likely going to croak soon.

There are so many keyboard shortcuts throughout Mac OS X and it’s myriad of third party apps that it’s easy to forget them or get lost trying to memorize the sea of keystrokes for each app. This is where CheatSheet will make your life easier, it’s a tiny free application that sits in the background waiting to be summoned from any app to instantly show all keyboard shortcuts for that application.

• Get CheatSheet for free from Media Atelier (requires OS X 10.7 or later)

After you’ve downloaded CheatSheet, place it in /Applications/ folder and the launch the app. Now from any application, hold down the Command key for a few seconds to summon the “Cheat Sheet” list of all keyboard shortcuts for that app. This allows you to quickly see even the most obscure shortcuts that would otherwise be buried deep within a submenu somewhere.

Here’s a quick video showing CheatSheet in use with Google Chrome and TextEdit:

Quick troubleshooting tips: if some apps aren’t responding to the hotkey, either relaunch those apps or try releasing and holding Command again and it should activate. Also if you’ve forgotten the meaning of Mac keyboard symbols it may be a good time to review those really quickly.

My only complaint about CheatSheet is that since it runs in the background you have to use something like Activity Monitor to easily quit out of it. Having an optional menu item to summon the cheat sheet for the active application, give you some control over basic settings like response time, and having a quick way to quit CheatSheet would be a nice touch, but this is a free app that is very useful as is so we really can’t complain too much.

Whether you’re a longtime Mac user or completely new to the platform, you are practically guaranteed to find CheatSheet useful. Get it now and thank me later.

You can image a Mac hard drive with the help of a free third party utility called Carbon Copy Cloner. The resulting image will be saved as the familiar .dmg format, this has a number of potential uses ranging from creating a drive clone for backup purposes, restoring the image elsewhere as a bootable backup, or even for deploying the same Mac OS X installation on multiple machines.

The process below will describe how to create an exact image replica of a selected Mac hard drive. If the hard drive being imaged is very large the resulting disk image is also going to be large, be sure to have adequate space to support the image or consider saving it to another location.

1. Get Carbon Copy Cloner free from Bombich and copy it to the /Applications/ folder
2. Launch Carbon Copy Cloner and pull down the “Source” menu, selecting “Macintosh HD” or whatever the Mac hard disk is named
3. Pull down the “Destination” menu and choose “New Disk Image”



4. Give the disk image a name and select a destination, if you don’t have the local storage capacity for such a large disk image be sure to choose an external or network drive as the image destination
5. Pull down the “Image Format” menu and choose “Read-only disk image”, this saves the image as the familiar DMG format



6. Click “OK”
7. Back at the main CCC menu, choose “Clone” to create the exact replica of the drive as a disk image file

The process of creating the disk image can take a very long time depending several factors, including the speed of the Mac, the size of the disk being imaged, and the destination of the image itself. Don’t be surprised if it takes quite a while to create the backup file.

When finished you’ll have an exact replica of the Macs hard drive in the form of a .dmg image file. If you intend on using the image on a Windows PC, you may want to convert it to an .iso first.

You’ll notice we didn’t choose to create an encrypted image, that is an option you can use if it fits your use case, though creating encrypted drive images takes even longer and they also have the potential of issues when restoring down the road.

If you want color icons back in your OS X Finder window sidebar but don’t want to deal with the existing procedures of manually installing SIMBL and the other components, grab SideEffects instead. SideEffects is a simple package that includes the three necessary components to add color back to Finder sidebar icons; SIMBL, ColorfulSidebar, and RelaunchFinder, all wrapped into a single easy to use installer to shorten the process considerably. Gone will be the drab grayscale icons, welcome back the color.

• Get SideEffects free from MacUpdate

SideEffects works with OS X 10.7.4 or later including Mountain Lion (supposedly).

For those wondering what is being installed and where it’s going, the files added by SideEffects are as follows:

SIMBL
/Library/ScriptingAdditions

ColorfulSidebar
/Library/Application Support/SIMBL/Plugins

RelaunchFinder
/Applications/RelaunchFinder.app

Also note that RelaunchFinder.app is also added to the active users login items so that the color icons take effect on each reboot or login.

Thanks to Simon for the tip, similar icon colorization is available for iTunes too.

The command line tool wget lets you retrieve a group of files from FTP and HTTP protocols, it’s a very useful utility for web developers and powerusers to have around because it lets you do things like perform quick and dirty site backups and even mirror websites locally.

This approach is going to build and install wget in OS X from source, this means you’ll need Xcode and the Unix dev tools (free @ Mac App Store) installed, but it has the benefit of eliminating the need of a package manager like Homebrew or MacPorts.

Assuming you have Xcode and the command line tools installed, launch Terminal and enter the following commands:

First, use curl to download the latest wget source:
curl -O http://ftp.gnu.org/gnu/wget/wget-1.13.4.tar.gz

Next we use tar to uncompress the files you just downloaded:
tar -xzf wget-1.13.4.tar.gz

Use cd to change to the directory:
cd wget-1.13.4

Configure with the appropriate –with-ssl flag to prevent a “GNUTLS not available” error:
./configure --with-ssl=openssl

Build the source:
make

Install wget, it ends up in /usr/local/bin/:
sudo make install

Confirm everything worked by running wget:
wget --help

Clean up by removing wget source files when finished:
cd .. && rm -rf wget*

You’re all set, enjoy wget in Mac OS X.

Platypus is an excellent utility that lets you turn virtually any script into a self-contained Mac OS X application. Free and remarkably simple to use, Platypus will support just about any shell script, Perl, Python, PHP, Ruby, Tcl, AppleScript, Expect, and even other scripting languages.

Using the app is easy, drag and drop a script onto the application, give it a name, assign an Output type (progress bar, script output, webkit view, etc), set drag & drop support or not, and adjust a few other variables as necessary. When done configuring, click “Create” to build a self-contained application that holds the script inside. The resulting application is completely portable and runs independently, letting you use the app on your own Mac or elsewhere, allowing for even novice users to perform complex tasks and run scripts that would otherwise be beyond their skill level to even execute.

The possibilities are practically endless so let your creativity go wild, because it’s Playtpus that makes apps like the troubleshooting tool Consultant’s Canary possible.

• Download Platypus free from Sveinbjorn

For a basic yet practical use case, build an app to perform a necessary repetitive task and add it to a users Login Items or put it in the Dock or Launchpad for easy novice access. It certainly beats trying to explain to someone how to run a bash script!

Virtually everyone knows you can click the yellow pill button in the upper left corner of a window to minimize a window in Mac OS X, but there are actually a few other ways minimize windows faster than that. The first is my preferred method which is a quick keystroke, and the other lets you double-click anywhere to send a window hiding.

The Minimize Window Keyboard Shortcut: Command+M

By far the fastest way to minimize windows is the Command+M keystroke, which works anywhere with the currently active window. You can modify it by adding an Option+H as well to minimize and hide everything including the currently active window with Command+Option+H+M

Double-Clicking Title Bars to Minimize Windows in OS X

Longtime Mac users should be familiar with this feature which lets you double-click anywhere in the titlebar to minimize a window. To do this in OS X, you’ll have to enable the feature in preferences:

• Open System Preferences and click on “General”
• Look under the scroll bar section and check the box next to “Double-click a window’s title bar to minimize”

This feature has been around in various forms since the early days of Mac OS 7, 8, and 9, long before OS X came along.

Troubleshooting computer problems is never particularly fun, and with so many potential third party add-ons, plugins, extensions, scripts, and whatever else is buried into OS X, how are you supposed to find everything to help determine what’s causing an issue? You need Consultant’s Canary, because whether you’re troubleshooting your own Mac or someone else’s, it’s going to save you tons of time and hassle.

Consultant’s Canary is a free self-contained python script that lists an absurd amount of information about the OS X installation that it’s launched from, including general system information, all login items, overly privileged processes, and a whole slew of third party system changes and augmentations, including address book plugins, Automator actions, additional frameworks, Safari plugins and extensions, kernel extensions, launchd jobs and launch agents, Mail plugins, third party System Preference panels, screen savers, Spotlight add ons, startup items, and more. Got all that? In other words, virtually every third party add-on that is currently installed on the Mac will be found and reported back in an easy to follow list that even includes the full file paths to the found items. Nothing is modified however, leaving the task of determining what doesn’t belong in the lists up to you.

• Get Consultant’s Canary free from KHI

Using Consultant’s Canary is easy, you can run the standalone Consultant’s Canary app directly on a single Mac which launches Terminal and a python script on it’s own, or you could open the apps package to find the heart of the app “dispatcher.py” which could then be used over a network to remotely diagnose and troubleshoot multiple Macs. The same version of Consultant’s Canary will work on any version of OS X later than 10.5, including Lion.

CC may just be the ultimate troubleshooting aid for Mac OS X, a remarkable feet for a free utility, making it’s an absolute must-have addition to a Mac power users toolkit.

Thanks to Jean N for the great tip

Ever wish you had a system wide equalizer to adjust all audio output in Mac OS X and not just in iTunes? Maybe you want to adjust the way all audio output sounds or maybe you just want to boost the output volume of the built-in Mac speakers. We’ll show you how to do both by creating your own universal EQ using two free tools, follow along:

Requirements

• Soundflower – free download from Google Code
• AU Lab – free download from Apple Developers (requires free Apple Dev ID)

Download and install both Soundflower and AU Lab, you will then need to restart your Mac to have full access to the audio components. Once rebooted, follow along with the instructions below:

Set Up a Universal Audio Equalizer for Mac OS X

1. Set System Volume to the maximum level, do this either through the menu bar or by hitting the Volume Up key repeatedly
2. Open System Preferences from the  Apple menu and select the “Sound” panel, followed by the “Output” tab. Select “Soundflower (2ch) from the Output list
3. Now launch AU Lab, found in /Applications/Utilities/
4. From the “Audio Input Device” pulldown menu, select “Soundflower (2ch)”, and then from “Audio Output Device” menu select “Stereo In/Stereo Out”
5. Click the “Create Document” button at the bottom of the screen
6. At the next screen, look for “Output 1″ column and click the “Effects” dropdown, selecting “AUGraphicEQ”
7. This is your new system-wide equalizer, set it how you see fit. Changes here will impact all audio output on the Mac
8. When satisfied with the EQ settings, hit Command+S to save the EQ settings file and put it somewhere easy to find like the Documents folder
9. Now open AU Lab preferences from the AU Lab menu, click on the “Document” tab and click the radiobox next to “Open a specific document”, selecting the .trak EQ file you saved in the previous step

Optional final step: If you want the EQ settings to load on every Mac OS X boot, right-click on the AU Lab icon, go to Options, and select “Open at Login”

It’s important to note that AU Lab must be running in order for the equalizer to have an effect, keeping it running will consume a small amount of CPU resources but it’s much less process hungry than some of the third party alternatives available on the market.

A big thanks to Dan Wong for sending in this tip

Photo Stream is an excellent iCloud feature that automatically syncs all pictures taken on an iPad, iPhone, or iPod touch to one anothers Photo libraries, and it will even sync with Mac OS X through the iPhoto app. Not everyone uses iPhoto to manage pictures though, and if you just want quick access to those pictures from the OS X Finder you can use a neat trick to access the entire iOS Photo Stream directly from the Mac desktop.

In order for this to work, you will need the following:

• Mac OS X 10.7.2 or later on the Mac, with iCloud configured
• iOS 5 or later on all iOS devices, with iCloud configured
• Photo Stream must be enabled on all iOS devices involved, and must be enabled on the Mac

If you don’t have iCloud set up and Photo Stream turned on, do that before proceeding.

Accessing the iOS Photo Stream from Mac OS X Finder

1. From anywhere on the OS X desktop, hit Command+Shift+G to bring up Go To Folder and enter the following path:

~/Library/Application Support/iLifeAssetManagement/assets/sub/


2. In the upper right corner of the Finder window, search for “Image” and select “Kind: Image” from the pull down menu



3. Now click the “Save” button to save this search, name it something like “Photo Stream” and check “Add To Sidebar” to keep the item in the sidebar

Now anytime you click “Photo Stream” in an OS X Finder window, you will get instant access to all images from the iOS Photo Stream from your iPhone, iPad, iPod touch, or all of the above.

For quick access to photos, this is easier and faster than transferring them all from iOS to the computer because it’s practically instantaneous and automatic, and it’s simpler than using the past tip for an AppleScript to save all images from Photo Stream because there is very little potential for error.

Once you have this set up you’ll likely find yourself using it very often, it’s so useful that hopefully the upcoming release of OS X Mountain Lion will include a similar featured enabled by default.

This is a variation on a great tip that was posted a while back by IconMaster to get to iOS screenshots from OS X, but by specifying any images in the search you can access all the Photo Stream images rather than only screen captures. If you do want to see only screen shots searching for file type “PNG” will achieve that.

There are tons of interesting pictures posted to Instagram all the time, but unless you’re using the iOS or Android app you can’t really see what’s going on there. That’s where Screenstagram comes in, it creates an attractive screen saver using an array of images pulled from either public photos or your personal Instagram feed.

There aren’t many options within the screen saver, but you can either specify a Instagram login and pull pictures from your own feed and who you follow, or just let it load from the “popular” public feed. For what it’s worth, Screenstagram is really at its best when you follow some interesting people who post things you actually want to see and not necessarily random photos from John Q Public.

• Download Screenstagram free from BarbarianGroup

If you’re not an Instagram fan you can also use Flickr feeds as screen savers, or go the oldschool route and build your own with a folder of pictures directly in Mac OS X.

A recent tip covered how to announce when a command line task finished by using OS X’s text-to-speech abilities. The obvious downside to that method is the sound makes it less useful to those who are using Macs in quiet environments like offices, schools, or libraries. An alternate solution is to use growlnotify to create a silent notification when a command line task has finished.

You will need the following for this to work:

• Growl ($2 App Store) or Growl Fork (free download)
• growlnotify installed

Assuming both Growl and growlnotify have been installed, append growlnotify to the end of another command and use the -m flag to specify the notification message to use after the initial command has finished running. For example:

make install && growlnotify -m "Install Completed"

The Growl message “Install Completed” will appear when make install has finished running.

Growl also makes it simple to send notifications to other hosts running growl, this can be done with the -H flag and by specifying an IP address. This is helpful if you’re compiling something large on a desktop Mac and want to send the completion notification to a MacBook Air while you’re working elsewhere.

The notification icon and other details can be modified through growlnotify command as well, use the –help flag to see all the options.

Thanks to Theo & Jason for the tip idea

Apple has pushed out another update to OS X Mountain Lion Developer Preview 3, as the anticipated summer public release of OS X 10.8 nears. The new build is 12A206j and can be downloaded through the Mac App Store by any registered Mac developer running 12A193i or later of Mountain Lion.

The latest build includes noticeable changes to Notification Center, Notes, Share Sheets, and several other prominent OS X 10.8 features. 12A206j also features many bug fixes though it continues to have a handful of prominent issues that are yet to be addressed. Additionally, some 2007 MacBook Pro models are currently missing support in the new version, though that is expected to be resolved in a future update.

Automatic termination is a feature of OS X Lion and OS X Mountain Lion that comes from the realm of iOS, the idea is that after an app is unused for a period of time and becomes inactive, it will automatically terminate to free up resources for other tasks. With the help of the new auto-save feature, the user should theoretically never notice any of this going on and they can continue on with their work as usual when they need to, letting Mac OS X manage processes and resources for them without quitting apps or manual interaction through Activity Monitor.

For the vast majority of users this is a good thing and most are probably completely unaware of the features existence, but not everyone is thrilled with the prospect of dormant applications being quit without their command and some find it really annoying. If you fall into the second category and want to turn off automatic app termination in OS X, here is how to do it. Don’t worry, we’ll also show you how to turn it back on.

Disable Automatic Termination in Mac OS X
Launch Terminal and enter the following defaults write command:

defaults write -g NSDisableAutomaticTermination -bool yes

Relaunch apps that use auto-termination for changes to take effect.

Re-Enable Automatic App Termination in Mac OS X
You can always reenable the default behavior of OS X and turn auto termination back on:

defaults delete NSDisableAutomaticTermination

Or by reversing “yes” to “no” and running the original command again:

defaults write -g NSDisableAutomaticTermination -bool no

Again, relaunch apps for the changes to take effect and to have auto-terminate enabled again.

This is something that Mac OS X and iOS handles fairly well, and if you’ve never been annoyed by the feature it’s recommended to leave it enabled and let OS X manage tasks itself.

Thanks to qwerty for finding the tip in a StackExchange thread.