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howto:linux:permissions

Permissions cheatsheet

Meaning of RWX Combinations

Octal digit Text equivalent Binary value Meaning
0 --- 000 All types of access are denied
1 --x 001 Execute access is allowed only
2 -w- 010 Write access is allowed only
3 -wx 011 Write and execute access are allowed
4 r-- 100 Read access is allowed only
5 r-x 101 Read and execute access are allowed
6 rw- 110 Read and write access are allowed
7 rwx 111 Everything is allowed

Meaning of RWX bits for files and folders

Access type File Folder
Read If the file contents can be read If the directory listing can be obtained
Write If user or process can write to the file (change its contents) If user or process can change directory contents somehow: create new or delete existing files in the directory or rename files.
Execute If the file can be executed If user or process can access the directory, that is, go to it (make it to be the current working directory)

Digital representation of setuid, setgid and sticky bits

Octal digit Binary value Meaning
0 000 setuid, setgid, sticky bits are cleared
1 001 sticky bit is set
2 010 setgid bit is set
3 011 setgid and sticky bits are set
4 100 setuid bit is set
5 101 setuid and sticky bits are set
6 110 setuid and setgid bits are set
7 111 setuid, setgid, sticky bits are set

Meanings of SUID, SGID and Sticky bits

SUID If set, then replaces "x" in the owner permissions to "s",
if owner has execute permissions, or to "S" otherwise.
Examples:
-rws------ both owner execute and SUID are set
-r-S------ SUID is set, but owner execute is not set
SGID If set, then replaces "x" in the group permissions to "s",
if group has execute permissions, or to "S" otherwise.
Examples:
-rwxrws--- both group execute and SGID are set
-rwxr-S--- SGID is set, but group execute is not set
Sticky If set, then replaces "x" in the others permissions to "t",
if others have execute permissions, or to "T" otherwise.
Examples:
-rwxrwxrwt both others execute and sticky bit are set
-rwxrwxr-T sticky bit is set, but others execute is not set
howto/linux/permissions.txt · Poslední úprava: 2014/01/29 03:12 (upraveno mimo DokuWiki)