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Open and write a file ruby

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Packing & Unpacking: A Guide to Reading Binary Data in Ruby

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Ruby input & output - I/O operations in Ruby

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Input & output in Ruby

The class IO provides all the basic methods, such as read, write, gets, puts, readline, getc, and printf. For more functions, please refer to Ruby Class IO. In the previous chapters, you have assigned values to variables and then printed the output using puts statement.
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The execution and the exception always go together. If you are opening a file, which does not exist, then if you did not handle this situation properly, then your program is considered to be of bad quality. The program stops if an exception occurs. So exceptions are used to handle various type of errors, which may occur during a program execution and take appropriate action instead of halting program completely. Ruby provide a nice mechanism to handle exceptions.
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