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In any operating system, various objects are existed which are graphically shown to the users on his/her operating system. Each object has a security attributes that identifies its access control list. This list has an entry for each system user with access privileges. Reading the files (or all the files in a directory), writing the file or files and execute the file or files (if it is an executable file, or program) are most common privileges included. Thus, an Access Control List (ACL) is a table that tells a computer which user has to given the access rights for a particular system object, such as a file directory or individual file. Each operating system uses the access control list but in different manner.
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