What Is Umask and How to Use it Effectively
What is Umask in Linux?
Umask (short for user file-creation mode mask) is used by UNIX-based systems to set default permissions for newly created files and directories. It does this by masking or subtracting these permissions. For example, with the usual Umask being set to 022 on most systems all the new files we create will subtract the Umask value from full permissions (for files that would be 666 - 022 = 644). Umask can be expressed in octal or symbolic values.
What are Inodes in Linux?
As you are probably already aware, everything is considered to be a file in Linux. That includes hardware devices, processes, directories, regular files, sockets, links, and so on. Generally, the file system is divided into data blocks and inodes. With that being said, you can think about inodes as a basis of the Linux file system. To explain it more clearly, an Inode is a data structure that stores metadata about every single file on your computer system.
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