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ssh2 access ssh2 access length 4 arr[0] "This is line one\n" Don't forget that I/O is never certain in an uncertain world---exceptions will be raised on most errors, and you should be ready to catch them and take appropriate action. Writing to Files So far, we've been merrily calling puts and print, passing in any old object and trusting that Ruby will do the right thing (which, of course, it does). But what exactly is it doing? The answer is pretty simple. With a couple of exceptions, every object you pass to puts and print is converted to a string by calling that object's to_s method. If for some reason the to_s method doesn't return a valid string, a string is created containing the object's class name and id, something like <ClassName:0x123456>.

ssh2 access The exceptions are simple, too. The nil object will print as the string ``nil,'' and an array passed to puts will be written as if each of its elements in turn were passed separately to puts. What if you want to write binary data and don't want Ruby messing with it? Well, normally you can simply use IO#print and pass in a string containing the bytes to be written. However, you can get at the low-level input and output routines if you really want---have a look at the documentation for IO#sysread and IO#syswrite on page 335. And how do you get the binary data into a string in the first place? The two common ways are to poke it in byte by byte or to use Array#pack .

ssh2 access str = "" "" str << 1 << 2 << 3 "\001\002\003" [ 4, 5, 6 ].pack("c*") "\004\005\006" But I Miss My C++ Iostream Sometimes there's just no accounting for taste...However, just as you can append an object to an Array using the<< operator, you can also append an object to an output IO stream: endl = "\n" $stdout << 99 << " red balloons" << endl produces: 99 red balloons Again, the << method uses to_s to convert its arguments to strings before sending them on their merry way.

ssh2 access Talking to Networks Ruby is fluent in most of the Internet's protocols, both low-level and high-level. For those who enjoy groveling around at the network level, Ruby comes with a set of classes in the socket library (documented starting on page 469). These classes give you access to TCP, UDP, SOCKS, and Unix domain sockets, as well as any additional socket types supported on your architecture. The library also provides helper classes to make writing servers easier. Here's a simple program that gets information about the ``oracle'' user on our local machine using the finger protocol.

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