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linux_wiki:list_set_and_change_standard_ugo_rwx_permissions [2016/02/28 22:58] billdozor created |
linux_wiki:list_set_and_change_standard_ugo_rwx_permissions [2019/05/25 23:50] |
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| - | ====== List Set And Change Standard Ugo Rwx Permissions ====== | ||
| - | |||
| - | **General Information** | ||
| - | |||
| - | About this page/ | ||
| - | |||
| - | ---- | ||
| - | |||
| - | ====== Permissions Overview ====== | ||
| - | |||
| - | Permissions tools | ||
| - | * chmod => Change permissions for user, group, other, or all | ||
| - | * chown => Change user/group ownership | ||
| - | |||
| - | Chmod Modes | ||
| - | * symbolic => represent permissions via u,g,o,a | ||
| - | * octal => represent permissions with numbers | ||
| - | |||
| - | Change file1 ownership to rjones and group to student | ||
| - | <code bash> | ||
| - | chown rjones: | ||
| - | </ | ||
| - | * You can leave off either the username or group name if only changing one of them, but the colon (:) must remain if only changing the group owner. | ||
| - | |||
| - | ---- | ||
| - | |||
| - | ===== List Permissions ===== | ||
| - | |||
| - | <code bash> | ||
| - | ls -l | ||
| - | -rw-r--r--. 2 root root 0 Jun 20 15:11 file1 | ||
| - | -rw-r--r--. 2 root root 0 Jun 20 15:11 file2 | ||
| - | drwxr-xr-x. 3 root root 17 Jun 20 14:50 newdir | ||
| - | </ | ||
| - | * First column => - (file), d (directory, l (symlink) | ||
| - | * Columns 2-4 => User owner permissions (rwx) | ||
| - | * Columns 5-7 => Group permissions (rwx) | ||
| - | * Columns 8-10 => Other permissions (rwx) | ||
| - | |||
| - | |||
| - | ---- | ||
| - | |||
| - | ===== Change Permissions ===== | ||
| - | |||
| - | === Symbolic === | ||
| - | |||
| - | * u => user owner | ||
| - | * g => group | ||
| - | * o => other users | ||
| - | * a => all users | ||
| - | |||
| - | Add write permissions to a file for the group | ||
| - | <code bash> | ||
| - | chmod g+w file1 | ||
| - | </ | ||
| - | |||
| - | Take away read permissions for others, for all of dir1 directory and its contents | ||
| - | <code bash> | ||
| - | chmod -R o-r dir1 | ||
| - | </ | ||
| - | * -R => recursively | ||
| - | |||
| - | Add execute permissions to directories only in a tree | ||
| - | <code bash> | ||
| - | chmod -R ug+X dir1 | ||
| - | </ | ||
| - | * For user owner and group => Adds execute to dir1 and all sub directories, | ||
| - | |||
| - | === Octal === | ||
| - | |||
| - | * 4 => read | ||
| - | * 2 => write | ||
| - | * 1 => execute | ||
| - | * Add together to get permissions | ||
| - | |||
| - | Set file1 permissions using octal notation | ||
| - | <code bash> | ||
| - | chmod 740 file1 | ||
| - | </ | ||
| - | * user owner => read(4), | ||
| - | * group => read(4) permissions | ||
| - | * others => no(0) permissions | ||
| - | |||
| - | ---- | ||