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| permissions [2021/03/09 20:02] – [User classes] hc9 | permissions [2024/09/06 06:17] (current) – no” hc9 |
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| ===== Permissions ===== | ===== Permissions ===== |
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| A Unix file system allows users to assign to files (including directories: "In Unix, Everything Is a File.") they own any combination of three permission types (**r**, **w**, **x**) to three classes of users (**u**, **g**, **o**). When a user requests access to a file, Unix first determines the requester's user class relative to the target file, then checks if the permission type requested has been assigned to that user class. | A Unix file system allows users to assign to files (including directories: “In Unix, Everything Is a File.”) they own any combination of three permission types (**r**, **w**, **x**) to three classes of users (**u**, **g**, **o**). When a user requests access to a file, Unix first determines the requester's user class relative to the target file, then checks if the permission type requested has been assigned to that user class. |
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| ==== Permission types ==== | ==== Permission types ==== |
| <user-classes><operation><permission-types>[,<user-classes><operation><permission-types>]… | <user-classes><operation><permission-types>[,<user-classes><operation><permission-types>]… |
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| //user-classes//User class(es) for which permissions are to be changed. Specify with one-character class symbols ''u'', ''g'', ''o'', or ''a'' for all classes. May specify more than one class. //operation//One of the following: ''+'' | |
| Add permission types to user classes.''-'' | |1|//user-classes//| |
| Remove permission types from user classes.''='' | | |User class(es) for which permissions are to be changed. Specify with one-character class symbols ''u'', ''g'', ''o'', or ''a'' for all classes. May specify more than one class.| |
| Set permission types for user classes.//permission-types//Permission type(s) to be set or removed. Use one-character type symbols ''r'', ''w'', or ''x''. May specify more than one type. | |2|//operation//| |
| | | |One of the following:| |
| | | | ''+'' Add permission types to user classes.| |
| | | | ''-'' Remove permission types from user classes.| |
| | | | ''='' Set permission types for user classes.| |
| | |3|//permission-types//| |
| | | |Permission type(s) to be set or removed. Use one-character type symbols ''r'', ''w'', or ''x''. May specify more than one type.| |
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| Therefore the command: | Therefore the command: |
| ''% chflags uunlnk foo'' | ''% chflags uunlnk foo'' |
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| would be used to set the user undelete flag, and to disable that flag, simply add "no" in front of the option (in this example, uunlnk), like so: | would be used to set the user undelete flag, and to disable that flag, simply add “no” in front of the option (in this example, uunlnk), like so: |
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| ''chflags nouunlnk foo'' | ''chflags nouunlnk foo'' |
| ---- | ---- |
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| $Id: permissions.html,v 1.8 2007/10/02 11:22:28 papa Exp $ [[http://sdf.org/?tutorials/permissions|File Permissions]] - legacy link | $Id: permissions.html,v 1.8 2007/10/02 11:22:28 papa Exp $ [[http://sdf.org/?tutorials/permissions|File Permissions]] - traditional link (using [[wp>Revision_Control_System|RCS]]) |
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