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Lines 3 and 4, like all script lines beginning with # (except the sh-bang line), are comments. These are included to provide a clue about what s going on for anyone reading the script. Comments have no effect on how the script runs and in this respect are purely optional elements. It is a good habit to use comments, not only for others who may be looking at your script but also for yourself should you have to look at a script weeks, months, or even years after you wrote it. Here the first comment line gives the name of the script, and the second comment describes what the script does. Line 6 shows us two things, the use of the set command and the use of backticks (`) in scripts. In a shell script, anything within backticks is executed, and the result is passed to the script (this is called command substitution). The set command sets the arguments used in the script just as if they were entered at the command line. So, line 6 takes the results from the ps acx | grep Finder command (which would be something like 261 S 0:00.93 Finder) and makes them our arguments (of which there would be 5). The importance of line 6 for the rest of the script is that it specifically assigns the PID of the Finder to our first argument that can then be accessed as the variable $1.

CHAPTER 19 EXTENDING THE POWER OF DARWIN 331 Line 8 sets the variable show to the result of the defaults read com.apple.finder AppleShowAllFiles command. defaults provides a way to access and alter Mac OS X user default settings from the command line. In this case, we use it to read the AppleShowAllFiles value stored in the com.apple.finder preference to determine the existing setting (0 or 1) so we can then toggle the setting. If the AppleShowAllFiles value doesn t exist yet in your Finder preference file, you will get an error similar to this:

Each source element is tested against the predicate function parameter. The element will be skipped if the predicate function returns true. The second prototype provides a zero-based index related to the elements of the sequence.

2007-06-26 12:24:00.175 defaults[1180] The domain/default pair of (com.apple.finder, AppleShowAllFiles) does not exist togglevis.sh: line 10: [: ==: unary operator expected

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1. Launch the Template Explorer, navigate to a template container, and select New Template. A new template named New Template appears in the template container. 2. Rename the new template (select Rename from the context menu). 3. Select File Save All to save your changes.

In this case you can ignore this, since the script will continue and actually create this value. However, if you continue to get errors after this (or if you get a vastly different error), then something else is wrong, and you should check your script closely. Lines 10 through 16 provide a conditional if...then...else statement and provide the expected actions based on the condition. First, in line 10 we check to see whether the show variable (which is the set value of com.apple.finder AppleShowAllFiles) is 1; if it is, then we move on to line 11 where we change com.apple.finder AppleShowAllFiles to 0. Then in line 12 we kill the Finder using $1, which we set in line 6. If the condition in line 10 is false (the show variable is not 1), then we move on to the else part of the script, and in line 14 we set com.apple.finder AppleShowAllFiles to 1 and then kill the Finder. Line 16 ends the if...then...else statement with fi (that s if backward). The script ends when it runs out of things to do. There are a few ways to run this script: one is to pass the script to the shell executable as an argument, and the other is to make the actual script executable. Passing the script as an argument to the shell looks like this:

If you want to have access to the script easily from anywhere, though, you must first make the script executable and make sure it s in a directory that is included in your $PATH (as discussed in the previous chapter). For example, we ve placed this file in our own bin directory, which you can see is set in our path with the following statement:

For an example of the SkipWhile method see Listing 1-33.

leopard:~/bin scott$ echo $PATH /opt/local/bin:/Users/scott/bin:/usr/local/bin:/bin:/sbin:/usr/bin:/usr/sbin

Your new template is now available in the MCMS Template Explorer under the gallery. The logical Template object has been created. Next an ASPX page to lay out boilerplate text, controls, placeholders, and scripts needs to be implemented and associated with Template objects.

To make it executable, we use the chmod command:

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