What is "umask" and how does it work?
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Lekensteyn
on Ask Ubuntu
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Published on 2011-05-22T20:42:56Z
Indexed on
2011/06/23
16:31 UTC
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permissions
|umask
I believe that umask is something that controls file permissions, but do not fully understand it.
After running umask 0644
in a terminal, I cannot read the files I create with the command-line text editor nano
. I noticed that the permissions of that file are set to 0022
instead of the default 0755
.
How does umask work? I thought I could just remove the each digit in the umask from 0777
, 7 - 6 = 1
and 7 - 4 = 3
, so I expect the permissions to be 0133
, but apparently, this is not the case.
- What is umask exactly? Explain it to me like I was a "Linux noob"
- How do I calculate with umask?
- What are use cases for umask?
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