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Linux permissions are a fundamental aspect of the operating system's security model, determining who can access files and directories and in what manner. These permissions are crucial for maintaining system integrity and security.
File and Directory Permissions
In Linux, every file and directory is associated with an owner and a group, and permissions are set for three categories of users: the owner, the group, and others. Permissions are represented symbolically as 'r' for read, 'w' for write, and 'x' for execute. For directories, these permissions have specific meanings:
Read: List the contents of the directory.
Write: Add or remove files from the directory.
Execute: Access the directory and its metadata.
Viewing Permissions
To view permissions, you can use the ls -l command, which displays a long listing format including file permissions. For example:
$ ls -ldrwxr-xr-x. 4 root root 68 Jun 13 20:25 tuned-rw-r--r--. 1 root root 4017 Feb 24 2022 vimrc Linux File/Directory Permissions cheat sheet - The Geek Diary
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