General :: Concept Of Umask - Default File And Directory Permissions
Apr 14, 2010
I am using Red Hat Linux 4 .There are some few questions in my mind related to umask. I want to know that is the default file and directory permissions ?
- When we use umask (022) command in terminal. and create a new file then the permissions applied for new file is for that session and when the system will reboot linux will take automatically its default permission from etc/bashrc or /etc/profile ?
- Can we make our own umask or the professional way is to follow 022 only ?
- What is the benefit of umask in Linux?
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Mar 16, 2011
My Debian system has by default umask permissions of 0022, which I never liked. One user can read all the files of another seems very insecure to me.
I am planing to set it to 007, so that user and group have rw but all others have none.
Are there any side effects to that? I have noticed from a trial I did where I was changing permissions on the filesystem that some system stuff in the OS does not work anymore, if "others" have no read permission anymore, so that is why I am asking.
And why are chmod / umask permissions sometimes stated as 4 digits? What is this "all" group in the end? Isn't that already covered by "others"?
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Apr 27, 2011
I'm having a bit of trouble understanding umask and mkdir in C++. In my program, I want to create a directory with the permissions 755.
If I do:-
Code:
The permissions come out all messed up.
But if I do:-
Code:
The permissions are set as expected.
I am having trouble understanding why umask(0); is needed, and what is the 'proper' way to use it so I can make my directory. From what I can understand from the man pages and everything, I need to set the umask in my program to allow it permission to make a directory with those permissions? And I don't get why umask(0); fixes it anyway!
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Jan 25, 2011
How to set the default file permissions on ALL newly created files in linux - but differs in important ways:
I want all files created in (or copied to or moved to) a certain directory to inherit a set of default permissions that is different from the system default.
Rationale: The directory in question is the "intake hopper" for an application. Users in a group place files in the directory, and the app (running under another user id in the same group) takes them and processes them. The problem is that the owner of each file placed in the directory is the user that placed it there, and the permissions are defaulting to "rw-r--r--"; I want to change that to "rw-rw----". The app doing the intake can't do that explicitly, because the user id the app is running under doesn't own the file in question, and the default permissions don't allow the app to chmod on the file! Obviously, the user could do a chmod after putting the file there - but I want to keep the "drop" by the user as simple as possible. (These folks are not linux-literate, they just drag and drop the files from their windows desktop to a (Samba) network share - i.e. they don't even know they are interacting with a linux system.)
umask seems too powerful: I don't want to set default permissions for every file created anywhere by these users - just those created in (or placed in) this directory.
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Jan 30, 2010
I'm struggling to understand an aspect of mounting and mountpoints with /etc/fstab. There is a large number of sites and threads that make recommendations using things like uid, gid, umask, and other options. These methods, however, which I've used, are file-system specific, useful only for filesystems such as (V)FAT and NTFS that allow them.My current situation is that I am mounting partition /dev/sdb5 in, let's call it /media/myMount. My goals:Mount this partition automatically upon boot using /etc/fstab...The partition should be fully accessible only to a specific user or group.What I've done is create the mount point in /media:
If user michapma were to carry out the mount, I believe it would work; however, I want the mount to happen automatically during boot. So, how can I achieve my user (or group) permission goals for this and any other such partitions using fstab?The manpage for mount has been helpful, but after reading many tutorials and forum threads, the only way I know how to do it is to have the user do the mounting or rely on the file-system specific options.
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Jan 15, 2010
I am attempting to modify the default umask value under all accounts on my linux system to 002. This will hopefully allow both the account and the account's group access to the created files.
I have modified it within /etc/bashrc, however it seems to be making no difference on this default value. The files I create through "File Browser" all have the access rights set to 600.
Is there any error here, as all evidence I can find on the internet points to the bashrc file.
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Jan 4, 2010
I think the following code is trying to change the settings inside the file:
CISum=077
sed -e "s/002/$CISum/" -e "s/022/$CISum/" /etc/bashrc-preCIS > /etc/bashrc
sed -e "s/002/$CISum/" -e "s/022/$CISum/" /etc/csh.cshrc-preCIS > /etc/csh.cshrc
[code].....
But, what if i only want to check what the settings are inside the file, but does not want any changes to the file.
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Feb 25, 2011
I've several questions to ask: Why do some files have black arrows pointed outward in my file system? Why are some files in compressed form, e.g. initrd.img?? How are such files used by the system??
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Jun 29, 2010
Every time I update certain packages with rpm/yum, they reset certain permissions on their files / directories which I have intentionally changed for various reasons. Is there a way I can override the permissions that the packagers have specified in the RPMs, and force it to keep the permissions/owner/group that I've set?On a Debian system, I would just use "dpkg-statoverride". I can't find any equivalent for RPM systems (CentOS 4 & 5 in my case).
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Jan 8, 2011
When I am creating a user (say sandy) on my FC14 system, I find that the default permissions for her home directory (/home/sandy) are 700.Can I somehow set up my system so that these permissions are 711 in place of 700.
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Jun 26, 2011
I have a file server running a cronjob to reset file permissions on a regular basis. I was thinking, I wonder if there is a way to do the chmod and chown command in a single command, as I always have to do both on the same folder, the way that you can do "chown root:users Uploads" instead of having to do two separate commands for chown and chgrp.
Then I got to thinking, are these commands even necessary? Every file copied or moved into these folders by any user needs to be something like "chmod 750" and "chgrp root:users", so rather than running a cronjob to do these modifications at regular intervals, there ought to be a way to set the folder permissions so that any files contained within will have these permissions.
The problem arises because users create documents, then a supervisor with elevated privileges can move those documents into a shared folder, however the permissions are wrong, they are user1:user1 for the owner and group and the other users can't read the file until a cronjob changes the group to be users. This has actually been acceptable, but certainly there is a better way to do this.
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Jul 3, 2011
my dad has been using Ubuntu for a few weeks now and likes it, however he's having some issues regarding read-only files. He's a doctor and frequently has to download word files to edit, however they always download as a read-only file. While this isn't particularly difficult to do, he finds doing it tiresome and because he isn't the most proficient PC user, may have difficulty with it when I return to school after the summer. I was hoping that there's some way to change the default settings so that all files downloaded are writeable.
Additionally, he has a number CD-RWs which he both retrieves files from and stores them to, however when trying to access these CDs he is told that they are read-only. Right clicking on the CD and trying to change the access permissions doesn't work (says that permissions can't be changed because the disc is read-only).
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May 14, 2010
Does anyone know why files in /boot are world-readable (particularly the initial ram disk)? I'm not an expert, but I would not expect anyone except root or a sudoer to have the ability to read these files.
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Jan 14, 2010
This is probably a pretty basic question seeing as I'm pretty new to Ubuntu Server. I'm running a simple website from my Ubuntu Server machine with The files are all stored in /var/www/ and then subdirectories. The problem is that when I add files through FTP I need to go and change all of the file permissions since by default they do not have read access so can't be accessed through a web browser on another machine.How can I make the default permissions readable for the directory and all new files that will be moved in it
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Feb 5, 2010
What do the default file permissions in ubuntu 9.10 protect/deny access to?
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Mar 28, 2011
Files saved on our ubuntu server via samba server are all being created/saved as read only (-rwxr--r--). The users are MAC Users who are connecting via finder.I have taken 2 steps:First I added the lines "umask 0000" to the .bashrc files in the users' home directories.Second, I have modified the /etc/samba/smb.conf file such that I set "create mask = 0000" and also "directory mask = 0000" but the files are still being created as "-rwxr--r--".
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Jun 28, 2011
When I create a new file/folder in a ext4 data partition, it has permissions:
owner: rwx
group: r
other: r
I would like to change this default to:
owner: rwx
group: rw
other: -
I tried changing fstab, but umask and guid are not supported mount options for ext4. What can I do?
Note: I know I can do a chmod, but I don't want to do this again and again for every new file I create.
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May 5, 2010
I had a major raid event recently which caused my Ubuntu 9.04 server to recover part of its file journal on the system partition. This caused some of the file permissions to go all funny and I now need to change them manually.
What the file permissions should for the following folders:
/etc/
/home/
/lost+found/
/mnt/
/root/
/sbin/
/srv/
/tmp/
The server is running and I fixed the some of the ownership issues already. I use a basic LAMP setup with samba, and proftp.
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Nov 18, 2010
I'm just wondering: I know that umask sets the default file permissions for files, however I want to know if there is anyway to set default file permissions for newly created directories.
For example, I want my user to create new directories that anyone can access and modify (777) but I want the new files the user creates to be 755 (read by everyone, written only by user).
Is this possible?
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Dec 4, 2009
I was working on a shell script to change the permissions of large directories and subdirectories because of an exploit discovered in the programs that run in those said directories that allow a client to upload and download files to the server. Loan behold I accidentally added a space and had something along the lines of "chmod -R 770 ." run on / logged in as root.
Yes, it was an incredibly noob move on my part, but nothing ventured nothing gained. I am surprisingly calm about this. I tried sliding in my CentOS installation disk and "Upgrading" CentOS but that only made it worse, beforehand I made everything owned by root so I could at least log into GNOME. This does not work for obvious reasons, namely having to change the permissions back for every user and every group, which far beyond a possibility.
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Nov 24, 2010
I have just installed SABnzb application in my home folder. The executable file is SABnzb.py When I run the command in the Konsole # python SABnzb.py I have this Quote: python: can't open file 'SABnzbd.py': [Errno 2] No such file or directory
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Jul 12, 2010
Is there a way to have a directory automatically change the permissions of a file that is written to it? I have a program which saves files to a directory, and gives those files read-only permissions to members in the group. This is a problem, because other users of my computer need to be able to edit these files. The directory itself has rw permissions for group members.
I guess what I am looking for is a way for the directory permissions to "override" the permissions the program is trying to save the files as. For example, if the directory has "rw" permissions for the group, then any file saved to it will automatically get the same permissions, regardless of what the program writing the file is trying to do.
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Apr 25, 2011
Not sure if this is the right place to ask this question. In Solaris we have umask (shell builtin) and /usr/bin/umask. However I could not find /usr/bin/umask in Linux.
I want to know the difference between both and how can we achieve the functionality of /usr/bin/umask in Linux as its not there...
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Jul 23, 2010
When setting up NFS what type of Linux file and directory permissions should you be familiar with?
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Mar 16, 2010
Is it possible to reset apache 2 permissions to default permissions I'm using Ubuntu 9.10 command line server, would webmin give me this access ?
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Jun 14, 2011
What I want to be able to do, is have create a group, for example called "group1" and set its default permissions to read & write, instead of the usual just read.
So when I add a user into "group1" they automatically have read & write access to all files & directories which is in "group1".
Oh & I use crunchbang 10 (statler) for my desktops & Ubuntu 11.04 for my NFS/print/SSH/etc/etc server
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Oct 26, 2010
This is on a customized Ubuntu 10.10 LiveCD. I have a directory which the default user "ubuntu" owns, and the permissions on the directory is 777. I'm unable to cd into the directory as ubuntu user. However as root user I'm able to access it. What could be the reason? I'm able to view the directory in nautilus.Note: I originally copied the folder over from an NTFS disk.
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Oct 20, 2009
I am confused that what should be the permssions of home directory because currenlty my users when they log into their home directory , they can see all the contents of /home directory as well..However if i take read all permissions then my sites are not accessible , what should i do The current permissions are 755
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Jun 30, 2011
I'm trying to create a script that when given a diretory, it goes traverses through all the subdirectories and process the files in them.However, there is one restriction.directories thatit traverses through must all have a read permission for the others group.How would I go about doing this?
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Feb 1, 2010
I have mounted samba volume and I need to have write permissions for every new folder that's being created (currently, by default, on every newly created folder i have only read and execute permissions).I tried changing umask, but with no effect on mounted folder, umask changed only for local filesystem. I tried mounting with umask option, but with no effect again.I'm using ArchLinux on this machine, and I installed samba using default package manager (pacman).
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