SPOJE.NET

Technická dokumentace

Uživatelské nástroje

Nástroje pro tento web


howto:linux:permissions

Rozdíly

Zde můžete vidět rozdíly mezi vybranou verzí a aktuální verzí dané stránky.

Odkaz na výstup diff

howto:linux:permissions [2014/01/29 03:12] (aktuální)
Řádek 1: Řádek 1:
 +====== Permissions cheatsheet ======
 +
 +[[man>​chmod]],​ [[man>​chown]]
 +
 +FIXME prepsat z http://​blog.harvie.cz/​useful-gnulinux-commands/​
 +
 +===== 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)