How to provide permission to a specific folder

Can anyone guide how to provide permission 开发者_如何学JAVAto file (a.txt) & folder or directory (a) xx-d-r-w

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Have a look a these links:

• http://www.perlfect.com/articles/chmod.shtml
• http://www.linuxforums.org/articles/file-permissions_94.html

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check your man pages for chmod

$man chmod