That will just launch the Simulator, I'm looking for a way to do the same as Cmd+R in the terminal, launching the Simulator AND running the app – Alex Chesters Jul 2 '15 at 8:57 The app must be installed trough Xcode to the simulator. If you’ve gotten some malware installed on your Mac—if, for example, you’re seeing bad pop-ups within your browser or you note that you’ve got one of the not-helpful-or-necessary. Aug 22, 2011 1) Boot from a Recovery Disk and Launch Terminal. First things first, regardless of which boot device you use, you have to open the Terminal. Boot from Recovery HD or the external Recovery Drive by holding Option at startup and selecting the disk, boot is completed when you see the “Mac.
OS X's command line and I have never been what I'd call 'friendly'; rather, we have a mutual respect and understanding about not messing with each other. (Well, as much of a mutual respect as one can have between a human being and a code window.)
While the average person should never have any reason to visit Terminal, Apple's command line interface app actually does give you access to quite a few neat tricks and shortcuts... if you're willing to take a peek.
What is Terminal?
Apple's Terminal app is a direct interface to OS X's bash shell — part of its UNIX underpinnings. When you open it, Terminal presents you with a white text screen, logged in with your OS X user account by default.
Here's the important part: With a system administrator account and password, you have direct access to tweaking almost everything about your computer's software code; that means that while this little window provides great power, it comes with great responsibility. In short, be careful before using Terminal to execute commands, and make sure you understand what you're typing.
You can also use Terminal to securely connect to other machines, web servers, and even create your own scripts, but those are how-tos for another day. For now, we're going to focus on using Terminal to explore your own computer.
Basic Terminal commands you should know
Before we get started with the fun stuff, let's learn some basic Terminal terminology and commands. These form the framework for more complex interactions (aka, the fun stuff).
How to execute a Terminal command
You can type something in the Terminal window until you're blue in the face, but it won't execute until you press the Return key on your keyboard. At that point, it will either return an error if you've typed something incorrectly, or the command will execute.
Unless you're executing a command that requires the display of text in Terminal, you won't have any indicator that what you've done has been successful; you'll just get a new line with your user name on it once the command is finished processing.
When writing commands and paths in Terminal, almost everything is case sensitive: This means that you need to remember to properly capitalize 'Dock' when referring to the Dock, or OS X won't understand your command.
What's a path?
You can use Terminal to get direct access to your files without using the Finder. To do so, you build something called a path. Paths look similar in some ways to website sub-directories, and follow the structure of your folders.
Best Mac Terminal App
Paths take two forms: absolute paths and relative paths. An absolute path starts at the root level of your hard drive, and is displayed as '/'. So if you wanted to make a path to your Applications folder, you would write '/Applications/'.
Relative paths are defined based on where you've already navigated to, and represented by './'. For instance, if you go to the '/Applications/' folder in Terminal, that's your current working directory (cwd). You can then get to your Utilities folder by typing './Utilities/' rather than '/Applications/Utilities'.
When you first launch Terminal, you're starting in the current working directory of /Users/myusername/ (also known as your User folder).
How to display and move between files in Terminal
To actually put all this path knowledge to use, you'll need the Terminal commands for displaying and changing files.
ls: The 'ls' command, by itself, displays the contents of the cwd. So if I were just to type 'ls' in Terminal, it would display the contents of my user directory:
You can optionally add an absolute or relative or path if you want to view a different directories. So, for example, if I wanted to view the Utilities folder inside Applications, I could type 'ls /Applications/Utilities/'. This won't change your current working directory, but it'll let you view other directories on your hard drive.
You can add options to view more information about that directory. The options for 'ls' include:
- -l, which lets you view the permissions of each file in the directory
- -R, which will not only show each folder in the directory, but all their files, as well
- -a, which will show any hidden files in the current directory
cd: Where the 'ls' command lets you view a directory, the 'cd' command will actually move to that directory (change your cwd). For instance, if after viewing the Utilities folder, you want to move to it, you'd type 'cd /Applications/Utilities/'.
pwd: Write this command by itself to help you remember the path of your current directory. When typed into terminal, it will print the full path of your cwd.
man: This command, followed by another Unix command, lets you read the Unix manual about the second command. This is super useful if you want to try a cool Terminal trick you found online, but aren't sure what those commands actually do.
For instance, typing 'man ls' will get you information on the 'ls' command, which lists directory contents.
How to modify files, folders, and preferences in Terminal
defaults: This command is often used in Terminal tips and tricks to tweak applications and system settings via their preference files. You can use it to do things like disable transparency in the menu bar, always show your scroll bars, change trackpad behavior, and much much more. You'll usually see this paired with either 'write' and a string, as with this:
The code above lets you save all your screenshots as JPGs instead of the system default PNG.
killall: If you execute a Terminal command that affects any system process or app, you're going to need to reboot the process to make it take effect. 'killall' followed by the process will do so. (This is also another way to force quit misbehaving apps or processes if your Force Quit menu isn't behaving.) Remember, this command and its target are case sensitive.
ln: OS X has long offered aliases, which let you create links to files, folders, and applications elsewhere in the system without having to duplicate them. Unfortunately, certain apps don't play well with aliases. With the link command 'ln -s', you can create a low-level, UNIX-based symbolic link which most system processes will recognize. Likely, you'll never have to make a symbolic link, but on the off-chance you want to perform a Terminal trick that requires them, this is how you do it.
The first path listed is your original file's path; the second path is where you'd like your symbolic link.
chflags: This commands lets you view and change the flags on a file or folder. For most people, the only flags you're going to care about are 'hidden' and 'nohidden', which hide and unhide documents, respectively.
sudo: If you spend any time online, you've probably heard of 'sudo' before. This is Unix's override command, and lets you execute any command as an administrator — provided, of course, that you have the requisite password and permissions. It probably goes without saying, but as a Terminal beginner, it's generally a good idea not to mess with commands like 'sudo' unless you are 100 percent sure what you're doing.
How to use Terminal for fun and whimsy
say: Feeling lonely? You can make your computer say anything you like with the 'say' command, and you can even record it in audio format to your desktop, if you so choose.
telnet towel.blinkenlights.nl: This isn't technically something local to your Mac, but it's my all-time favorite Terminal trick. Some kind soul on the internet made an all-ASCII version of Star Wars: A New Hope; run the following code, and you'll be treated to a full showing. If it doesn't make you smile just a little bit, you might be dead inside.
macOS Catalina
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Terminal For Mac
The Terminal is generally reserved as an environment for advanced configuration of your Mac, but there are those who resort to it on a regular basis and use it in conjunction with OS X’s graphical interface to make optimal use of the system. If you do so, then you might find yourself periodically wanting to launch an application, either directly from the command line, or from an automated action like a script. In addition, you can use this feature to launch multiple instances of a standard OS X program, or run it as a different user, such as root, which can give you access to the system in ways you might otherwise not have.
The classic way
As with general Terminal syntax, you can launch an executable script or binary file from the Terminal by simply entering its full path. However, to do so for an OS X app with a graphical interface, you will need to specify the app’s executable file within the application package. In most cases, this will be a subdirectory called /Contents/MacOS/ that contains an executable with the same name as the app. For instance, opening TextEdit in the Applications folder will require you run the following command:
This can be useful for troubleshooting problems with the program, since you will see console output (errors, warnings, and sometimes other activity) output directly to the Terminal window hosting the program, as opposed to having to use the Console utility.
If you would like to run the app as a different user (e.g., the root account), then you can first switch user accounts in the Terminal with the “su” command, or use “sudo” before specifying the path to the Mac OS application, and this will launch the program as root (note that this might not always work):
Keep in mind that launching a program in this way will launch a new instance of it, so if you have TextEdit already open, then you will see another TextEdit program open next to it. This has its benefits in some circumstances, but can interfere with services like Apple’s Resume feature (ie, it may overwrite your current window configuration so when TextEdit is quit, current window positions will not be saved and then restored when the program is next opened).In addition, keep in mind that when opened in this manner, the Terminal window will be hosting the program, so it must remain open while the program is running—if you close the Terminal window, you will force-quit the program you have opened.
Open Terminal In Mac
Using the “open” command
One of OS X’s unique Terminal commands is the “open” command that allows you to handle files, programs, and URLs in sometimes unique ways. The benefit of this program is, similar to using the Terminal for directly launching an app in the “classic” way; however, it does have two benefits. First, it is easier to use, and second, it does not require the Terminal remain open:
In this command, replace “appname” with the name of your desired app, and it should launch. Note that by default this command will, similar to the OS X graphical environment, only open one instance of an app, so if the program is already open then this command will switch to it. However, you can use this command to open another instance of the program, by adding the “-n” flag:
Keep in mind that as with the classic approach, multiple instances of an application running at the same time under the same user account may have odd consequences with supporting services that the application uses; however, for simple programs and utilities it can be useful to run another instance as root, in order to overcome permissions limitations with your current user account. Also consider apps like the Calculator, where it might be useful to have more than one calculation going at a time.
Launch Applications From Terminal Mac
With the command run multiple times, you will open multiple instances of the program.