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umask is a fundamental command in Linux that sets the default permissions for newly created files and directories. It's a mask that determines which permission bits will not be set when a file or directory is created.
How umask Works
When a file or directory is created, Linux assigns default permissions to it. For files, the default permissions are typically 666 (read and write for everyone), and for directories, it's 777 (read, write, and execute for everyone). However, these default permissions are modified by the umask value, which acts as a subtractive mask.
Here's a simple way to understand how umask modifies permissions:
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WEBJul 28, 2022 · Linux allows some processes to inherit system umask values, or to be given their own umask settings. For example, useradd uses a umask setting to create new users' home directories. A umask …
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WEBFeb 23, 2021 · The umask utility allows you to view or to set the file mode creation mask, which determines the permissions bits for newly created files or directories. It is used by mkdir, touch, tee , and other commands that …
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WEBThe umask acts as a set of permissions that applications cannot set on files. It's a file mode creation mask for processes and cannot be set for directories itself. Most applications would not create files with execute …
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WEBNov 7, 2023 · 0002 means that the first digit 0 is known as a sticky bit, which is a special security feature. The next three digits denote the octal umask value of the file or directory umask. Syntax. The basic syntax of …
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