Questions tagged [umask]
Mask that controls which file permissions are set for files and directories when they are created. It also refers to a function that sets the mask, and to the mask itself, which is formally known as the file mode creation mask.
188 questions
4
votes
1
answer
63
views
What are the rules that determine file permissions of b after I do cp /path/to/a /p/t/b, depending on file permissions of /path/to/a and all dirs?
In Classic Shell Scripting from O'Reilly, Arnold Robbins and Nelson H.F. Beebe write the follwing example:
$ umask
023
$ rm -f foo
$ cp /bin/pwd foo
$ ls -l /bin/pwd foo
-rwxr-xr-x 1 root root ...
- 2,179
1
vote
1
answer
27
views
umask value leaked when logging in into a different account
[user@localhost ~]$ umask
027
$ sudo su -
[root@localhost ~]# umask
0027
[root@localhost ~]# exit
[user@localhost ~]$ umask 0022
[user@localhost ~]$ umask
0022
$ sudo su -
[root@localhost ~]# umask
...
- 43
2
votes
1
answer
376
views
Default umask for NFS user nobody
I have an nfs mount created on a Linux server, and a process that is creating directories and files dynamically as it runs. As expected, the directories have an owner:group of nobody:nogroup.
The ...
- 860
1
vote
0
answers
413
views
Changing default umask in an ubuntu 20 docker image/container
I'm trying to make an ubuntu-based docker image that does a bunch of stuff and also creates files and directories on the host from time to time (in a bind-mounted folder). I'd like to set the umask ...
- 131
0
votes
0
answers
111
views
login.defs only for specified user
I need to set umask for specified user for all file he will make:
from terminal and from file manager ex Dolphin.
I have set umask in /etc/login.defs but now ALL user have this umask.
There is a way ...
- 109
2
votes
1
answer
82
views
Why does setting `umask` to `0077` (and then downloading public key) makes a gpg public key unavailable for apt?
Why does setting umask to 0077 makes a gpg public key unavailable for apt when installing a package, e.g.
umask 0077
curl -fsSLo /usr/share/keyrings/brave-browser-beta-archive-keyring.gpg https://...
- 817
0
votes
1
answer
59
views
/etc/samba/smb.conf: With what command's logical approach the octal values are based?: chmod or umask?
About Samba I am reading the following valuable tutorial:
How to Set Up a Network Shared Folder on Ubuntu With Samba
At the Step 2: Configuring Samba section appears the following configuration
[...
- 2,040
1
vote
0
answers
64
views
How was the formula for calculating umask derived?
When using umask, I know that to get the resulting permission, the mask is first NOTed and then it is ANDed with the default permission (777 or 666).
Now my question is, how was this formula derived? ...
- 327
0
votes
0
answers
28
views
Umask questions in mount [duplicate]
I have a question regarding 'umask.' I have an extra disk on my Linux system, and I want it to mount during startup with the same permissions as '/home.' For example, my '/home' has these permissions:
...
0
votes
1
answer
210
views
Why SSSD Service override_homedir triggers creation of home directory with wrong permissions?
I have a vendor application installed in an Ubuntu Jammy server that relies on SSSD v2.6.3 configured for LDAP integration for the authentication and creation of the home directory of the user in the ...
0
votes
1
answer
56
views
why resets `desktop-file-edit` the permissions of a file?
let's say i have set the umask system-wide to 027 via a one-liner at /etc/profile.d/ on a multiuser-system. after some time resp. reboots i want to hide an existing desktop-file system-wide from the ...
- 527
0
votes
1
answer
166
views
What determines UMASK for Oracle Job using UTL_FILE?
A PL/SQL job foobar622 writes files to UNIX/LINUX server using the following Oracle file I/O commands:
UTL_FILE.FILE_OPEN
UTL_FILE.PUT_LINE
UTL_FILE.FILE_CLOSE
In the past the files had these ...
- 393
0
votes
1
answer
2k
views
Converting server to allow Apache write access to certain directories, does this solution look right?
I've been at this all day and think I finally figured it out, but want to make sure before I put it into production.
I'm changing my server to allow the apache:apache user write permission on a few ...
- 836
0
votes
2
answers
297
views
Umask set weird result for files when apply value 0666
umask shows the weird results when applying value: 0666
When apply any value for umask that works as aspected, but when apply 0666 then directory got correct permission value but file got weird value.
...
0
votes
0
answers
37
views
How to change the (u)mask in Linux to get a certain permission for a file? [duplicate]
What value of (u)mask should I use to give the permission -rwxr-xr-- for the files?
I tried 012 and 022 and didn't work, how do I subtract 666-754?
