In Windows, each file has a set of attribute bits that can sometimes be changed with the attrib command.
|Windows File Attributes|
|R||Read-only||This locks the file so that its contents cannot be changed until the read-attribute is removed. Files marked read-only are also slightly more difficult to erase. When you restore files from CD (Compact Disc), they often have the read-only attribute which you must remove before programs can use the files. In Java you can discover the state of this attribute with File. canWrite()|
|H||Hidden||This file is mildly hidden. You may optionally decide whether to include it in directory listings. Programs can still read it if they know the file’s name. You can’t discover the state of this bit in pure java. You must use JNI (Java Native Interface). Java’s File. list() ignores the hidden attribute and gives you everything, hidden and revealed.|
|N||Normal||This is a file, not a directory. This is what File. isFile() looks for.|
|D||Directory||This is a directory, not a file. This is what File. isDirectory() looks for.|
|S||System||This file belongs to the operating system, and thus it would not be wise to delete it unless you know what you are doing. You can’t discover the state of this bit in pure java. You must use JNI.|
|T||Temporary||This file is fair game for deleting. Normally such files are automatically erased when a program terminates, but when a program crashes, its temporary files may not be deleted properly. Temporary files are safe to delete. Unfortunately, many temporary files are not marked with this attribute or any other distinguishing feature. You can’t discover the state of this bit in pure java. You must use JNI. Vista does not automatically delete such files. You must run a scavenger program every once in a while to scan the disk to find and delete them.|
|A||Archive||Has this file been changed since the last backup. Primitive system to track what needs backup. It is rough indication the file has changed.|
|O||Offline||This has something to do with Microsoft’s feature to cache web content locally. I’m not sure, but I think this means the original lives on some other machine.|
|I||not-Indexed||This file or directory is not partipating in the MS FastFind indexing. I am not sure if this attribute bit will also suppress Google desktop indexing. You can remove it with attrib -i *.*.|
In xml, html and jnlp, an attribute is a name=value modifier on a tag.
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