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Calculate and convert Unix file permissions between different formats. Essential for Linux and Unix system administration, this tool helps you understand and set proper file permissions using octal, symbolic, or visual representations.
755 means owner has read/write/execute (7), group has read/execute (5), and others have read/execute (5). It's commonly used for executable files and directories.
Octal uses numbers (755), symbolic uses letters (rwxr-xr-x). Both represent the same permissions but octal is more compact while symbolic is more descriptive.
Use 644 for regular files (owner read/write, others read-only) and 600 for sensitive files (owner-only access). Avoid 777 as it gives everyone full access.
Directories need execute permission to be accessed. Common directory permissions are 755 (public access) or 700 (owner-only access). Without execute, you can't enter the directory.