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programs automatically, and most programs stick to using them for input and output. The redirection symbols write the standard output of a program to a file (>) or read a file and pass the data to the standard input. Shell scripts don t execute code quickly, but it s easy to write code in C or another language that does run quickly. Thus programs are rarely written as 100% shell scripts, but rather use the shell scripting language as a way to integrate various programs. One of the nicest things about shell scripting is that each program can be independently tested and verified easily; reuse is also more practical, because the program as a whole can be placed in another project wholesale.

So now you have several ways of creating strings, but what can you do with them Just like numbers, strings have operators that can be used to create new strings. If you add two strings together, you get a new string containing the first string with the second string appended to the end. You can add strings with the + operator just like you do with numbers; let s try it: >>> "I love "+"Python!" 'I love Python!'

public class hello { public void sayHello() { System.out.println("hello"); } public static void main(String[] args) { hello app = new hello(); app.sayHello(); } } Create this class with the standard Eclipse class wizard. Then, use the File Export wizard to create a jar file in your home directory. Figure 10-6 shows the jar file export page.

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need to manually add port forwarding to your router; see the next section, Manually Configuring the Router.

You need to copy this jar file to the target for execution. For your system, the home directory is likely something other than /home/gene. After this jar file has been created in your home directory, ensure that it can be executed by running it from the command line: $ cd ~ $ java -cp test.jar hello hello

Python has added two strings together and displayed the result. Adding strings together like this is called string concatenation. You can concatenate any two strings together, but you can t concatenate a string with a number. Let s try it anyway to see what happens: >>> "high "+5 Traceback (most recent call last): File "<interactive input>", line 1, in TypeError: cannot concatenate 'str' and 'int' objects Here we have tried to produce the string 'high 5' by adding the number 5 to a string. This doesn t make sense to Python, and it lets you know by throwing another exception. If you do want to add a number to a string, you have to first convert the number to a string. You can easily create strings from numbers by constructing a new string from that number. Here s how you would create our high 5 string. >>> "high "+str(5) 'high 5' This works because str(5) constructs a string from the number 5, which Python will happily concatenate with another string. You can also use the multiply (*) operator with strings, but you can only multiply strings by integers. Take a guess at what the following line of Python code will do: >>> 'eek! '*10 You can see that Python can be quite intuitive; if you multiply a string by 10 it will repeat it 10 times. Strings do not support all mathematical operators such as / and , because it s not intuitive what they would do. What could "apples" "oranges" possibly mean

C aution When you re remote debugging Java, make sure you re using the Sun or IBM Java implementation.

To attempt to automatically configure your router, perform the following steps: 1. Click Setup next to the Router option, as shown in Figure 11-6. 2. You are informed that Windows Home Server will attempt to configure port forwarding for your router, as shown in Figure 11-7. Click OK to continue.

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