Unix Permissions Calculator - farukguler.com

File Type:

File Directory Symbolic Link

Special Permissions:

SetUID (s) SetGID (s) Sticky Bit (t)

Permission

Owner (u)

Group (g)

Others (o)

Read (4)

Write (2)

Execute (1)

⚠️ Directories require execute (x) permissions to be accessible.

⚠️ SetUID should only be used for executable files.

⚠️ SetGID should only be used for executable files or directories.

⚠️ Sticky Bit should only be used for directories.

Symbolic Notation:

-rw-r-----

Numeric (Octal) Notation:

Chmod Command:

chmod 640 file

Recursive Chmod Command:

chmod -R 640 directory

Symbolic Chmod Command:

chmod u=rw,g=r,o= file

About Permissions:

r (read): View file content, list directory contents

w (write): Modify file content, create/delete files in a directory

x (execute): Execute a file, enter a directory

SetUID (s): Executes with the file owner's permissions

SetGID (s): Executes with the group's permissions, directories inherit the parent's group

Sticky Bit (t): Only the file owner or root can delete/rename files in the directory