An acronym for Uniform Type Identifier - a text string that uniquely identifies a given class or type of item.

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42
votes
11answers
41k views

What file comparison tool can I use under OS X?

My favorite file comparison tool was Beyond Compare but since I recently switched to OS X, i'm no longer able to use it and I'm looking for an alternative, preferably a free one. Update: I made the ...
17
votes
4answers
1k views

Why does “Copy” replace stuff instead of merging it?

This is started to be really annoying to me If you have an original folder with 2 files and you copy something into it's parent folder where the folder name is the same, and, let's imagine you are ...
15
votes
2answers
2k views

File sizes greyed out (strange extended attributes) in Finder on Lion?

I just got a new machine with Lion preinstalled. After transferring all my applications, I noticed that the file sizes (and only the sizes) of some applications and folders are greyed out: Does ...
14
votes
12answers
4k views

What orthodox file manager for OS X could I use?

I'm looking for a graphical file manager fro OS X, for console Midnight Commander is ok. I need two panels, function keys operations and preferably FTP and SCP support. Also, it would be great to be ...
13
votes
4answers
1k views

Choose a default app for opening files with no extension?

Is it possible to set a default application to open files with no extension? I'm not referring to files with hidden extensions, but those completely lacking an extension -- e.g. README, CHANGELOG, ...
12
votes
6answers
10k 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 ...
11
votes
2answers
4k views

What is the difference between .command, .tool, and .sh file extensions?

I saw a couple of questions about executing command line scripts? I saw that the .command and .tool extensions were mentioned. I have always used .sh. What is the difference between these different ...
10
votes
5answers
8k views

What does .ipa stand for?

What does the .ipa file extension (used for iOS app bundles) stand for? I'm guessing that it has something to do with iPhone app, but I'm not sure.
10
votes
3answers
766 views

What is the “+” mark at the end of file description?

When I execute 'ls -al~', I see + marks, and it prevents me from moving/deleting files. drwxr-xr-x+ 5 prosseek admin 170 Oct 5 03:43 Desktop drwxr-xr-x+ 17 prosseek admin 578 Sep 25 ...
10
votes
4answers
182 views

Cutting and pasting files

OS X doesn't allow me to cut files. Are there any applications to enable this?
9
votes
4answers
996 views

Revert Filetype Association

I occasionally work with iTunes Music Store packages. These packages have a .itmsp extension. Like .app, .itmsp is essentially a container directory. .itmsp folders contain XML and media files. The ...
9
votes
4answers
5k views

Hide ONLY .app file extensions but show the rest

Is there a way to hide ONLY .app file extension? I know that you can enable or disable the visibility of file extensions in Finder but I'm interested in avoiding .app file extensions from showing up. ...
8
votes
8answers
8k views

is there free OS X equivalent to Total Commander? [duplicate]

is there free equivalent to Total Commander for OSX? two panels drag & drop tabs etc ect I found DoubleCommander the best but OSX port has its bugs. muCommander is nice too but not as good as ...
8
votes
1answer
462 views

What does the “Stationery Pad” option do?

Under the General section of a file's File Info, there is a checkbox for Stationery Pad and Locked. The Locked option is pretty straightforward, but what does Stationery Pad do?
8
votes
3answers
2k views

How can I associate a file extension with a content type?

I have some files with extension "module" and "inc," which are PHP files. When I try to open them, the list of applications that can open them shows only the application I have set as default ...
8
votes
1answer
2k views

Is there a QuickLook preview for plain-text files with unknown extensions?

A similar question was asked here but the answer refers to something called QL Stephen, which only claims to preview files with no extension. I need something that will show previews of files with ...
7
votes
7answers
2k views

How can I copy the path of a file?

This surely sounds weird to PC users ;-), but my actual question is "How can I copy the path to a folder or a file ?" The Info Dialog doesn't allow me to copy the information that stands there ... ...
6
votes
2answers
367 views

Is it possible to attach a file to an email from the command line?

I am often using the terminal, and I'd like to be able type a command that will attach a selected file to an email in mail.app. :~ mailme myfile Any idea on how to do that?
6
votes
1answer
4k views

What command combo at terminal will output a list of directories with human-readable sizes?

I'd like to open Terminal.app and enter a command like: my-macbook-pro:~ my-username$ ls -lh Instead of seeing the size of the folders in bytes that are in my current working directory, I'd like to ...
6
votes
7answers
854 views

Changing the default screenshot filename

Is there a way to change the default screenshot filename prefix (the Cmd-Shift-4 type screenshot) to something other than the default? The default name looks like this: Screen Shot 2011-08-30 at ...
6
votes
5answers
2k views

What directory comparison tools can I use on OS X?

I am looking for a tool that is able to compare directories, not only files. Also it is important to be able to call the tool from the command line. It would be great to have a free tool, if not free ...
6
votes
3answers
3k views

How to check what's locking a file?

I noticed that sometimes Mail.app locks files. The lock itself allows for files to be moved to Trash, but doesn't allow Trash to be emptied. (Perhaps Trash should be renamed Thrash in this case) Is ...
6
votes
3answers
210 views

Moving folder to Trash in Finder is not synchronized with Terminal

I tried to delete a folder which I access via terminal.app. Though the Finder moved the folder to the Trash, I was still able to see the contents and edit the file from terminal. created a textfile ...
5
votes
4answers
4k views

how can I move multiple files at once?

I'm really new to Macs, and finding file operations to be really frustrating after Linux. If I have a Finder window open with 5 files that I want to move to a different folder, I can select all 5 ...
5
votes
4answers
759 views

How do I create files in Finder without Terminal?

On windows, when you right click then you have option to create files. I want to do that too on Mac, how can I do that without terminal?
5
votes
1answer
320 views

How can I open a file in its default application from the command line in OS X?

How can I open a file in its default application from the command line? For example if I have a file foo.doc, can I type command ./foo.doc into the CLI and have that file open in Word? Note: on my ...
5
votes
1answer
2k views

Why is a command line change to ~/Library/Preferences/com.apple.LaunchServices.plist not effective immediately?

When the Info window of Finder is used to associate files of a particular type with an application: the preference is effective immediately. When Terminal is used to make a comparable addition ...
5
votes
2answers
165 views

How can I look inside iOS apps' folders from within iTunes?

When looking at an app's documents with iTunes (in the Apps tab of the iDevice), it is possible to view folders of the documents created by the apps. How can I look inside them? Double-clicking does ...
4
votes
2answers
127 views

What breaks if I delete the folders named Public and Sites?

The default home folder on Mac OS X has folders named Public and Sites. I never use them, so what will possibly break if I delete them?
4
votes
5answers
158 views

Information/File Manager

I'm looking for a file manager application which helps to organize a large amount of movies, pictures, music, text documents, databases, audio-books and ebooks. Right now I only use the Finder which ...
4
votes
4answers
3k views

Gray file in finder

Is there any way to force Finder to refresh its in-use information for gray (inaccessible) files? Details: I move infrequently used files from my Mac (OS/X 10.6) to a Windows server 2008 file ...
4
votes
1answer
187 views

What are those ._<name> files?

I downloaded a Java library and noticed, that for every file and directory there is a binary file of the form ._<name>. It contains something like: "Mac OS X ... com.apple.quarantine ... ...
4
votes
1answer
383 views

How can I associate OpenOffice documents with OpenOffice apps instead of TextEdit?

I just updated to Mountain Lion. My documents were prepared in OpenOffice and contain many mathematical equations. After updating to Mountain Lion, the documents open in TextEdit instead of ...
4
votes
1answer
435 views

Preventing applications from creating folders in your documents folder

I have two applications (Microsoft RDP Client and Parallels Desktop) that insist on creating their own folders in my Documents folder. They use those to store user-specific files, settings, profiles ...
4
votes
1answer
932 views

Where are Services stored?

I created a service using Automator and noticed that it created a .workflow file in ~/Library/Services. Is this the same file that handles the service that I see under (Application's Name) > Services? ...
4
votes
1answer
658 views

How can I make OS X recognize new file extensions?

In Finder.app, you can hit Enter to edit the name of the currently selected file or folder. OS X will automatically select only the file name part, not the extension: This is very useful, because ...
4
votes
2answers
3k views

What are “dmgpart” files and what tools can create, merge, or manage them?

I downloaded something that came as three large files: One was a *.dmg (a disk image file, which I expected) and two more were *.dmgpart files, which I haven't happened to see before – I never ...
4
votes
2answers
3k views

How to change the creation (st_birthtime) date/time of a file in Lion?

touch(1) can only change modification and access times, but has no options for creation time. This does not work, at least not on Lion. So how do I change the creation time, also referred to as ...
4
votes
1answer
721 views

Mount RAM Disk at boot with a specific path?

I'd love to mount a RAM Disk in OSX Lion on boot. I know how to write the launchd stuff to do it when I want, but is it possible to mount a RAM Disk onto a certain path, so that it would be cleared ...
4
votes
2answers
2k views

How do I disable quarantine on Lion?

I've been tearing my hair out trying to get rid of the quarantine "Do you want to open this?" warning because I don't like it. The well documented way (defaults write com.apple.LaunchServices ...
4
votes
1answer
204 views

Open as text option for every file, regardless of what OS X thinks of it [duplicate]

Possible Duplicate: How to permanently put TextEdit in the Open with… menu list? Being a programmer, I often work with text files. As you probably know, file extensions are more or ...
3
votes
3answers
3k views

What's the simplest way to password protect a text file?

I'd like to password protect a text file. Not necessarily a .txt file - just a file that's got text in it that I can edit with a standard text editor. I'd like to set a password and be prompted for it ...
3
votes
2answers
784 views

Do I need to have system administrator permissions to install from the Mac App Store?

Where does the Mac App Store install its applications to? Is this a system-wide location, or somewhere inside my Home directory? Is it possible to use the App Store on machines where I am not a System ...
3
votes
2answers
442 views

How do I set the creation time of a file?

I have a script that converts a file to another format, and I want the resulting file to have the same timestamps as the original, including the creation time (as shown by ls -lU). I can use touch to ...
3
votes
1answer
193 views

Does osx file organization works like Ubuntu's?

I mean, does mac have a "home" folder, and if I want to format and reinstall the system, it'll not affect my home folder? And the Desktop is a folder within the home folder?
3
votes
2answers
4k views

How do I view .wtv files in OS X?

I have a Windows 7 Media Center machine for our family's DVR. It creates recorded TV files in a .wtv format (used to be .ms-dvr in the Vista days). We have a laptop running Lion that I'd like to ...
3
votes
4answers
1k views

Files Renamed in Finder not Reflected in iTunes?

I just did a batch rename in Finder (using AppleScript), however the filenames in iTunes remain unchanged. I tried restarting iTunes and that did not help. I also tried iTunes >>> File >>> Library ...
3
votes
1answer
391 views

.app extension in Spotlight or Alfred

I would like to have all applications names displayed without the .app extension in Spotlight or Alfred. Reeder for example is listed as "Reeder", whereas Sparrow is listed as "Sparrow.app". Which ...
3
votes
4answers
174 views

OS X Lion All Files Showing as Type of Document

I had an issue where my MacBook Air would not start a couple days back, so I reinstalled the OS. I ran the reinstallation from the recovery partition. Ever since then, almost all of my files show as ...
3
votes
1answer
2k views

Good PostScript viewer for MacOS?

On OS X, is there a good application to open PS files without converting them to PDF? In addition, I want to associate PS.GZ files to this application, but retain the TAR.GZ association to my ...