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- Version 5.4.6: Default Folder X 5.5b1 (Beta), (macOS 10.15) Default Folder X 4.7.4 (OS X 10.6.8 or later, Intel64/Intel32). Default Folder X 4.5.12 (OS X 10.5 or later, Intel 64/Intel32/PPC 32). There's a new Quick Start panel that's displayed the first time you run Default Folder X or if you choose 'Quick Start' from its menu in the menu bar.
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(Redirected from File Permissions and Attributes)
File systems use permissions and attributes to regulate the level of interaction that system processes can have with files and directories.
Warning: When used for security purposes, permissions and attributes only defend against attacks launched from the booted system. To protect the stored data from attackers with physical access to the machine, one must also implement for an explanation of the possible values.The permissions that the owner has over the file, explained below.The permissions that the group has over the file, explained below.The permissions that all the other users have over the file, explained below.A single character that specifies whether an alternate access method applies to the file. When this character is a space, there is no alternate access method. A .
character indicates a file with a security context, but no other alternate access method. A file with any other combination of alternate access methods is marked with a +
character, for example in the case of Access Control Lists.Each of the three permission triads (
rwx
in the example above) can be made up of the following characters:Character | Effect on files | Effect on directories | |
---|---|---|---|
Read permission (first character) | - | The file cannot be read. | The directory's contents cannot be shown. |
r | The file can be read. | The directory's contents can be shown. | |
Write permission (second character) | - | The file cannot be modified. | The directory's contents cannot be modified. |
w | The file can be modified. | The directory's contents can be modified (create new files or folders; rename or delete existing files or folders); requires the execute permission to be also set, otherwise this permission has no effect. | |
Execute permission (third character) | - | The file cannot be executed. | The directory cannot be accessed with cd. |
x | The file can be executed. | The directory can be accessed with cd; this is the only permission bit that in practice can be considered to be 'inherited' from the ancestor directories, in fact if any folder in the path does not have the x bit set, the final file or folder cannot be accessed either, regardless of its permissions; see path_resolution(7) for more information. | |
s | The setuid bit when found in the user triad; the setgid bit when found in the group triad; it is not found in the others triad; it also implies that x is set. | ||
S | Same as s , but x is not set; rare on regular files, and useless on folders. | ||
t | The sticky bit; it can only be found in the others triad; it also implies that x is set. | ||
T | Same as t , but x is not set; rare on regular files, and useless on folders. |
See
info Coreutils -n 'Mode Structure'
and chmod(1) for more details.Tip: You can view permissions along a path with
namei -l path
.Examples
Let us see some examples to clarify:
Archie has full access to the Documents directory. He can list, create files and rename, delete any file in Documents, regardless of file permissions. His ability to access a file depends on the file's permission.
Archie has full access except he can not create, rename, delete any file. He can list the files and (if file's permission empowers) may access an existing file in Documents.
Archie can not do 'ls' in Documents but if he knows the name of an existing file then he may list, rename, delete or (if file's permission empowers him) access it. Also, he is able to create new files.
Archie is only capable of (if file's permission empowers him) access those files in Documents which he knows of. He can not list already existing files or create, rename, delete any of them.
You should keep in mind that we elaborate on directory permissions and it has nothing to do with the individual file permissions. When you create a new file it is the directory that changes. That is why you need write permission to the directory.
Let us look at another example, this time of a file, not a directory:
Here we can see the first letter is not
d
but -
. So we know it is a file, not a directory. Next the owner's permissions are rw-
so the owner has the ability to read and write but not execute. This may seem odd that the owner does not have all three permissions, but the x
permission is not needed as it is a text/data file, to be read by a text editor such as Gedit, EMACS, or software like R, and not an executable in its own right (if it contained something like python programming code then it very well could be). The group's permissions are set to r--
, so the group has the ability to read the file but not write/edit it in any way — it is essentially like setting something to read-only. We can see that the same permissions apply to everyone else as well.Changing permissions
chmod is a command in Linux and other Unix-like operating systems that allows to change the permissions (or access mode) of a file or directory.
Text method
To change the permissions — or access mode — of a file, use the chmod command in a terminal. Below is the command's general structure:
Where
who
is any from a range of letters, each signifying who is being given the permission. They are as follows:u
: the user that owns the file.g
: the user group that the file belongs to.o
: the other users, i.e. everyone else.a
: all of the above; use this instead of typingugo
.
The permissions are the same as discussed in #Viewing permissions (
r
, w
and x
).Now have a look at some examples using this command. Suppose you became very protective of the Documents directory and wanted to deny everybody but yourself, permissions to read, write, and execute (or in this case search/look) in it:
Before:
drwxr-xr-x 6 archie users 4096 Jul 5 17:37 Documents
After:
drwx------ 6 archie users 4096 Jul 6 17:32 Documents
Here, because you want to deny permissions, you do not put any letters after the
=
where permissions would be entered. Now you can see that only the owner's permissions are rwx
and all other permissions are -
. This can be reverted with:
Before:
drwx------ 6 archie users 4096 Jul 6 17:32 Documents
Filemaker pro 17 advanced 17 0 4 400 download free. After:
drwxr-xr-x 6 archie users 4096 Jul 6 17:32 Documents
In the next example, you want to grant read and execute permissions to the group, and other users, so you put the letters for the permissions (
r
and x
) after the =
, with no spaces.You can simplify this to put more than one
who
letter in the same command, e.g:Note: It does not matter in which order you put the
who
letters or the permission letters in a chmod
command: you could have chmod go=rx file
or chmod og=xr file
. It is all the same.Now let us consider a second example, suppose you want to change a
foobar
file so that you have read and write permissions, and fellow users in the group users
who may be colleagues working on foobar
, can also read and write to it, but other users can only read it:Before:
-rw-r--r-- 1 archie users 5120 Jun 27 08:28 foobar
After:
-rw-rw-r-- 1 archie users 5120 Jun 27 08:28 foobar
This is exactly like the first example, but with a file, not a directory, and you grant write permission (just so as to give an example of granting every permission).
Text method shortcuts
The chmod command lets add and subtract permissions from an existing set using
+
or -
instead of =
. This is different from the above commands, which essentially re-write the permissions (e.g. to change a permission from r--
to rw-
, you still need to include r
as well as w
after the =
in the chmod command invocation. If you missed out r
, it would take away the r
permission as they are being re-written with the =
. Using +
and -
avoids this by adding or taking away from the current set of permissions).Let us try this
+
and -
method with the previous example of adding write permissions to the group:Before:
-rw-r--r-- 1 archie users 5120 Jun 27 08:28 foobar
After:
-rw-rw-r-- 1 archie users 5120 Jun 27 08:28 foobar
Another example, denying write permissions to all (a):
Before:
-rw-rw-r-- 1 archie users 5120 Jun 27 08:28 foobar
After:
-r--r--r-- 1 archie users 5120 Jun 27 08:28 foobar
A different shortcut is the special
X
mode: this is not an actual file mode, but it is often used in conjunction with the -R
option to set the executable bit only for directories, and leave it unchanged for regular files, for example:Copying permissions
Default Folder X 5 0 6 Spd
It is possible to tell chmod to copy the permissions from one class, say the owner, and give those same permissions to group or even all. To do this, instead of putting
r
, w
, or x
after the =
, put another who letter. e.g:Before:
-rw-r--r-- 1 archie users 5120 Jun 27 08:28 foobar
After:
-rw-rw-r-- 1 archie users 5120 Jun 27 08:28 foobar
This command essentially translates to 'change the permissions of group (
g=
), to be the same as the owning user (=u
). Note that you cannot copy a set of permissions as well as grant new ones e.g.:In that case chmod throw an error.
Numeric method
chmod can also set permissions using numbers.
Using numbers is another method which allows you to edit the permissions for all three owner, group, and others at the same time, as well as the setuid, setgid, and sticky bits. This basic structure of the code is this:
Where
xxx
is a 3-digit number where each digit can be anything from 0 to 7. The first digit applies to permissions for owner, the second digit applies to permissions for group, and the third digit applies to permissions for all others.In this number notation, the values
r
, w
, and x
have their own number value:To come up with a 3-digit number you need to consider what permissions you want owner, group, and all others to have, and then total their values up. For example, if you want to grant the owner of a directory read write and execution permissions, and you want group and everyone else to have just read and execute permissions, you would come up with the numerical values like so:
- Owner:
rwx
=4+2+1=7 - Group:
r-x
=4+0+1=5 - Other:
r-x
=4+0+1=5
This is the equivalent of using the following:
To view the existing permissions of a file or directory in numeric form, use the stat(1) command:
Where the %a option specifies output in numeric form.
Most folders and directories are set to
755
to allow reading, writing and execution to the owner, but deny writing to everyone else, and files are normally 644
to allow reading and writing for the owner but just reading for everyone else; refer to the last note on the lack of x
permissions with non executable files: it is the same thing here. To see this in action with examples consider the previous example that has been used but with this numerical method applied instead:
Before:
-rw-r--r-- 1 archie users 5120 Jun 27 08:28 foobar
After:
-rw-rw-r-- 1 archie users 5120 Jun 27 08:28 foobar
If this were an executable the number would be
774
if you wanted to grant executable permission to the owner and group. Alternatively if you wanted everyone to only have read permission the number would be 444
. Treating r
as 4, w
as 2, and x
as 1 is probably the easiest way to work out the numerical values for using chmod xxxfilename
, but there is also a binary method, where each permission has a binary number, and then that is in turn converted to a number. It is a bit more convoluted, but here included for completeness.Consider this permission set:
If you put a 1 under each permission granted, and a 0 for every one not granted, the result would be something like this:
You can then convert these binary numbers:
The value of the above would therefore be 775.
Consider we wanted to remove the writable permission from group: Snippetslab 1 8 4.
The value would therefore be 755 and you would use
chmod 755 filename
to remove the writable permission. You will notice you get the same three digit number no matter which method you use. Whether you use text or numbers will depend on personal preference and typing speed. When you want to restore a directory or file to default permissions e.g. read and write (and execute) permission to the owner but deny write permission to everyone else, it may be faster to use chmod 755/644 filename
. However if you are changing the permissions to something out of the norm, it may be simpler and quicker to use the text method as opposed to trying to convert it to numbers, which may lead to a mistake. It could be argued that there is not any real significant difference in the speed of either method for a user that only needs to use chmod on occasion.You can also use the numeric method to set the
setuid
, setgid
, and sticky
bits by using four digits. For example,
chmod 2777 filename
will set read/write/executable bits for everyone and also enable the setgid
bit.Bulk chmod
Generally directories and files should not have the same permissions. If it is necessary to bulk modify a directory tree, use find to selectively modify one or the other.
To chmod only directories to 755:
To chmod only files to 644:
Changing ownership
chown changes the owner of a file or directory, which is quicker and easier than altering the permissions in some cases.
Consider the following example, making a new partition with GParted for backup data. Gparted does this all as root so everything belongs to root by default. This is all well and good but when it comes to writing data to the mounted partition, permission is denied for regular users.
As you can see the device in
/dev
is owned by root, as is the mount location (/media/Backup
). To change the owner of the mount location one can do the following:Before:
drwxr-xr-x 5 root root 4096 Jul 6 16:01 Backup
After:
drwxr-xr-x 5 archie root 4096 Jul 6 16:01 Backup
Now the partition can have data written to it by the new owner, archie, without altering the permissions (as the owner triad already had
Note:rwx
permissions).chown
always clears the setuid and setgid bits.- Non-root users cannot use
chown
to 'give away' files they own to another user.
Access Control Lists
Access Control Lists provides an additional, more flexible permission mechanism for file systems by allowing to set permissions for any user or group to any file.
Umask
The umask utility is used to control the file-creation mode mask, which determines the initial value of file permission bits for newly created files.
![Default folder x 5 0 6 x 2 Default folder x 5 0 6 x 2](https://static.filehorse.com/screenshots-mac/cleaning-and-tweaking/default-folder-x-mac-screenshot-01.png)
File attributes
Apart from the file mode bits that control user and group read, write and execute permissions, several file systems support file attributes that enable further customization of allowable file operations. This section describes some of these attributes and how to work with them.
Warning: By default, file attributes are not preserved by cp, rsync, and other similar programs.
chattr and lsattr
For ext2 and ext3 file systems, the e2fsprogs package contains the programs lsattr and chattr that list and change a file's attributes, respectively. Though some are not honored by all file systems, the available attributes are:
a
: append onlyc
: compressedd
: no dumpe
: extent formati
: immutablej
: data journallings
: secure deletiont
: no tail-mergingu
: undeletableA
: no atime updatesC
: no copy on writeD
: synchronous directory updatesS
: synchronous updatesT
: top of directory hierarchy
For example, if you want to set the immutable bit on some file, use the following command:
To remove an attribute on a file just change
+
to -
.Extended attributes
From xattr(7): 'Extended attributes are name:value pairs associated permanently with files and directories'. There are four extended attribute classes: security, system, trusted and user.
Warning: By default, extended attributes are not preserved by cp, rsync, and other similar programs, see #Preserving extended attributes.
Extended attributes are also used to set Capabilities.
User extended attributes
User extended attributes can be used to store arbitrary information about a file. To create one:
Use getfattr to display extended attributes:
Finally, to remove an extended attribute:
Preserving extended attributes
Command | Required flag |
---|---|
cp | --preserve=mode,ownership,timestamps,xattr |
mv | preserves by default1 |
tar | --xattrs for creation and extraction |
bsdtar | -p for extraction |
rsync | --xattrs |
- mv silently discards extended attributes when the target file system does not support them.
To preserve extended attributes with text editors you need to configure them to truncate files on saving instead of using rename(2).[1]
Tips and tricks
Preserve root
Use the
--preserve-root
flag to prevent chmod
from acting recursively on /
. This can, for example, prevent one from removing the executable bit systemwide and thus breaking the system. To use this flag every time, set it within an alias. See also [2].See also
Retrieved from 'https://wiki.archlinux.org/index.php?title=File_permissions_and_attributes&oldid=637543'
Unlike the software developed for Windows system, most of the applications installed in Mac OS X generally can be removed with relative ease. Default Folder X is a third party application that provides additional functionality to OS X system and enjoys a popularity among Mac users. However, instead of installing it by dragging its icon to the Application folder, uninstalling Default Folder X may need you to do more than a simple drag-and-drop to the Trash.
Download Mac App RemoverWhen installed, Default Folder X creates files in several locations. Generally, its additional files, such as preference files and application support files, still remains on the hard drive after you delete Default Folder X from the Application folder, in case that the next time you decide to reinstall it, the settings of this program still be kept. But if you are trying to uninstall Default Folder X in full and free up your disk space, removing all its components is highly necessary. Continue reading this article to learn about the proper methods for uninstalling Default Folder X .
Manually uninstall Default Folder X step by step:
Most applications in Mac OS X are bundles that contain all, or at least most, of the files needed to run the application, that is to say, they are self-contained. Thus, different from the program uninstall method of using the control panel in Windows, Mac users can easily drag any unwanted application to the Trash and then the removal process is started. Despite that, you should also be aware that removing an unbundled application by moving it into the Trash leave behind some of its components on your Mac. To fully get rid of Default Folder X from your Mac, you can manually follow these steps:
1. Terminate Default Folder X process(es) via Activity Monitor
Before uninstalling Default Folder X , you’d better quit this application and end all its processes. If Default Folder X is frozen, you can press Cmd +Opt + Esc, select Default Folder X in the pop-up windows and click Force Quit to quit this program (this shortcut for force quit works for the application that appears but not for its hidden processes).
Open Activity Monitor in the Utilities folder in Launchpad, and select All Processes on the drop-down menu at the top of the window. Select the process(es) associated with Default Folder X in the list, click Quit Process icon in the left corner of the window, and click Quit in the pop-up dialog box (if that doesn’t work, then try Force Quit).
2. Delete Default Folder X application using the Trash
First of all, make sure to log into your Mac with an administrator account, or you will be asked for a password when you try to delete something.
Open the Applications folder in the Finder (if it doesn’t appear in the sidebar, go to the Menu Bar, open the “Go” menu, and select Applications in the list), search for Default Folder X application by typing its name in the search field, and then drag it to the Trash (in the dock) to begin the uninstall process. Alternatively you can also click on the Default Folder X icon/folder and move it to the Trash by pressing Cmd + Del or choosing the File and Move to Trash commands.
For the applications that are installed from the App Store, you can simply go to the Launchpad, search for the application, click and hold its icon with your mouse button (or hold down the Option key), then the icon will wiggle and show the “X” in its left upper corner. Click the “X” and click Delete in the confirmation dialog.
Download Mac App Remover3. Remove all components related to Default Folder X in Finder
Though Default Folder X has been deleted to the Trash, its lingering files, logs, caches and other miscellaneous contents may stay on the hard disk. For complete removal of Default Folder X , you can manually detect and clean out all components associated with this application. You can search for the relevant names using Spotlight. Those preference files of Default Folder X can be found in the Preferences folder within your user’s library folder (~/Library/Preferences) or the system-wide Library located at the root of the system volume (/Library/Preferences/), while the support files are located in '~/Library/Application Support/' or '/Library/Application Support/'.
Open the Finder, go to the Menu Bar, open the “Go” menu, select the entry:|Go to Folder.. and then enter the path of the Application Support folder:~/Library
Search for any files or folders with the program’s name or developer’s name in the ~/Library/Preferences/, ~/Library/Application Support/ and ~/Library/Caches/ folders. Right click on those items and click Move to Trash to delete them.
Meanwhile, search for the following locations to delete associated items:
- /Library/Preferences/
- /Library/Application Support/
- /Library/Caches/
Besides, there may be some kernel extensions or hidden files that are not obvious to find. In that case, you can do a Google search about the components for Default Folder X . Usually kernel extensions are located in in /System/Library/Extensions and end with the extension .kext, while hidden files are mostly located in your home folder. You can use Terminal (inside Applications/Utilities) to list the contents of the directory in question and delete the offending item.
4. Empty the Trash to fully remove Default Folder X
If you are determined to delete Default Folder X permanently, the last thing you need to do is emptying the Trash. To completely empty your trash can, you can right click on the Trash in the dock and choose Empty Trash, or simply choose Empty Trash under the Finder menu (Notice: you can not undo this act, so make sure that you haven’t mistakenly deleted anything before doing this act. If you change your mind, before emptying the Trash, you can right click on the items in the Trash and choose Put Back in the list). In case you cannot empty the Trash, reboot your Mac.
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You may not notice that, there are a few of Mac applications that come with dedicated uninstallation programs. Though the method mentioned above can solve the most app uninstall problems, you can still go for its installation disk or the application folder or package to check if the app has its own uninstaller first. If so, just run such an app and follow the prompts to uninstall properly. After that, search for related files to make sure if the app and its additional files are fully deleted from your Mac.
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