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Perl での部分参照の作り方。

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The output may be like this:

value_2_1
value_2_1

It is because -> is omittable when it's between [ ] or { }.

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Useful commands on Mac OS X

newsyslog

rotates log files (this is not only for Mac OS X).

open

opens file(s) or directory(es) on Finder. You can even specify the application with which you want to open the file.

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main () {
	var tmp = null;
	for (var i=0;++i<101;) {
		print ((tmp = (i%3?'':'Fizz')+(i%5?'':'Buzz')) == '' ? i : tmp);
	}
}

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main () {
 var age = 21;
 var name = {"first":"taro","last":"yamada"};
 print ("Happy birthday, ${name['first'].toUpperCase()}, you're ${age++} today.");
}

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How to install MongoDB 2.0 on Mac OS X (>= Leopard)

Procedure

The whole install procedure is like the following.
You would have to do 7 steps.

1. Download the latest tar file, and expand it.
2. Move it to /usr/local/, and make a symbolic link to the folder.
3. Add path to MongoDB binaries.
4. Make an user that "mongod" runs on, and group that owns the user.