File alteration monitoring techniques under Linux
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Most modern operating systems provide file monitoring facilities to give applications real-time information about changes to the filesystem. A variety of notification methods are used to tell the application when a change happens, ranging from an asynchronous signal being sent from the kernel through a user space tool printing the name of the changed file on its standard output. We'll take a look at some of the file monitoring facilities available to the Linux developer, starting with the lowest-level mechanism and working up to the highest.
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