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I"IA <code>File</code> is an abstraction of any file object accessible ;TI"Iby the program and is closely associated with class <code>IO</code> ;TI"6<code>File</code> includes the methods of module ;TI"H<code>FileTest</code> as class methods, allowing you to write (for ;TI".example) <code>File.exist?("foo")</code>.;To:RDoc::Markup::BlankLineo;	;[I")In the description of File methods, ;TI"6<em>permission bits</em> are a platform-specific ;TI"Dset of bits that indicate permissions of a file. On Unix-based ;TI"Gsystems, permissions are viewed as a set of three octets, for the ;TI"Downer, the group, and the rest of the world. For each of these ;TI"Eentities, permissions may be set to read, write, or execute the ;TI"
file:;T@o;	;[I"DThe permission bits <code>0644</code> (in octal) would thus be ;TI"Finterpreted as read/write for owner, and read-only for group and ;TI"Gother. Higher-order bits may also be used to indicate the type of ;TI"Hfile (plain, directory, pipe, socket, and so on) and various other ;TI"Cspecial features. If the permissions are for a directory, the ;TI"Gmeaning of the execute bit changes; when set the directory can be ;TI"searched.;T@o;	;[I"FOn non-Posix operating systems, there may be only the ability to ;TI"Fmake a file read-only or read-write. In this case, the remaining ;TI"Ipermission bits will be synthesized to resemble typical values. For ;TI"=instance, on Windows NT the default permission bits are ;TI"H<code>0644</code>, which means read/write for owner, read-only for ;TI"Fall others. The only change that can be made is to make the file ;TI"7read-only, which is reported as <code>0444</code>.;T@o;	;[I"OVarious constants for the methods in File can be found in File::Constants.;T:
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