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Linux Beginner

What is File Permissions?

A security mechanism that controls who can read, write, or execute files and directories in Unix-like systems.

Linux file permissions use a three-tier system: owner, group, and others. Each tier can have read (r=4), write (w=2), and execute (x=1) permissions. For example, chmod 755 grants the owner full access while giving read and execute access to everyone else.

Special permissions include SUID, SGID, and the sticky bit, which provide additional access control for specific use cases.

Related Terms

Firewalld
A dynamic firewall management tool for Linux that provides a D-Bus interface for managing firewall rules with zones.
Crontab Syntax
The time specification format used in cron job scheduling, with five fields defining minute, hour, day of month, month, and day of week.
Nftables
The modern Linux packet filtering framework that replaces iptables with a unified, more efficient rule-processing architecture.
Chmod
A command to change file and directory access permissions using numeric or symbolic notation.
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A Linux kernel feature that provides isolated network stacks with independent interfaces, routing tables, and firewall rules.
Iptables
The traditional Linux firewall tool that filters network packets using configurable chains of rules organized in tables.
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