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OpenRead
OpenRead["
file
"] opens a file to read data from, and returns an InputStream object.
OpenRead prepares to read from a file, starting at the beginning of the file.
On systems that support pipes, OpenRead["!
command
"] runs the external program specified by command, and opens a pipe to get input from it.
If OpenRead does not succeed in opening a particular file or pipe, it generates a message, and returns $Failed.
OpenRead resolves file names according to the procedure described in Section A.6.1.
The function ReadList automatically opens files or pipes that it needs.
OpenRead returns InputStream["
name
",
n
], where name is the full name of a file or command, and n is a serial number that is unique across all streams opened in the current Mathematica session.
Setting the option DOSTextFormat->True causes all input to be treated as coming from a text-mode file on an MS-DOS or related system. This means that \n\r pairs are interpreted as single newlines, and   Z is interpreted as EndOfFile.
See the Mathematica book: Section 2.11.7.
See also: Close, Read, ReadList, Streams, LinkCreate.
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