How to grant permissions for a file?
Answer
Managing access permissions for files and directories in Linux operating systems is a fundamental security element. Permissions determine exactly who can read a file, modify it, or execute it, which protects the system from unauthorized access and accidental errors.
•To make a text file an executable script, use the chmod command by adding a plus sign and the letter x, for example, chmod +x script.sh. After that, the file can be executed directly through the terminal.
•For precise permission configuration, alphanumeric notation or symbolic modes are used, for example, the command chmod 755 file sets standard permissions for executable programs and scripts that are readable by all users.
•Changing the file owner and user group is performed using the chown command, which takes the new owner's name and, separated by a colon, the group name, for example, chown user:group file, which is critical when configuring web servers and services.
•The numerical permission system is based on summing three basic numeric codes for three categories of users: the owner, the group, and others. The number 4 represents read permission, the number 2 stands for write, and the number 1 grants execute permission.
•The value 755, frequently applied to directories and programs, is interpreted as the sum of permissions: the digit 7 gives the owner full read, write, and execute permissions (4+2+1), while the fives for the group and others allow only reading and execution (4+1).
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