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When to wrap quotes around a shell variable?
Could someone tell me whether or not I should wrap quotes around variables in a shell script?
5 Answers
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Build an ASCII chart of the most commonly used words in a given text [closed]
...utions, you can simply pass the filename as argument. (i.e. ruby1.9 wordfrequency.rb Alice.txt)
Since I'm using character-literals here, this solution only works in Ruby 1.9.
Edit: Replaced semicolons by line breaks for "readability". :P
Edit 2: Shtééf pointed out I forgot the trailing space - ...
StatusbarTools 扩展 - 状态栏自定义工具 · App Inventor 2 中文网
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故障排除
常见问题
Q: 状态栏颜色设置无效？
A: 检查应用是否具有必要的权限，某些设备需要额外的设置。
Q: 图标颜色不改变？
A: 确保使用正确的参数值（”Light” 或 “Dark”），检查设备...
SecurityError: Blocked a frame with origin from accessing a cross-origin frame
...appen trying to access the following URLs from http://www.example.com/home/index.html
URL RESULT
http://www.example.com/home/other.html -> Success
http://www.example.com/dir/inner/another.php -> Success
http://www.example.com:80 ...
What is the maximum value for an int32?
...y rule to remember 1,867,996,680? I find it difficult to remember at which index to start looking....
– Alderath
Jan 13 '16 at 8:35
10
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How do I limit the number of returned items?
...ith exec() instead. Therefore, with the mongoose 3.8.1 you'd do this:
var q = models.Post.find({published: true}).sort({'date': -1}).limit(20);
q.exec(function(err, posts) {
// `posts` will be of length 20
});
or you can chain it together simply like that:
models.Post
.find({published: tr...
Efficient Algorithm for Bit Reversal (from MSB->LSB to LSB->MSB) in C
...// Option 2:
unsigned char * p = (unsigned char *) &v;
unsigned char * q = (unsigned char *) &c;
q[3] = BitReverseTable256[p[0]];
q[2] = BitReverseTable256[p[1]];
q[1] = BitReverseTable256[p[2]];
q[0] = BitReverseTable256[p[3]];
You can extend this idea to 64-bit ints, or trade off memo...
How do I get the parent directory in Python?
...me is the function for this, like a+=5-4 is more convoluted than a+=1. The question requested only the parent directory, not whether is exists or the true parent directory assuming symbolic links get in the way.
– tzot
May 24 '10 at 12:03
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Delete all the queues from RabbitMQ?
I installed rabbitmqadmin and was able to list all the exchanges and queues. How can I use rabbitmqadmin or rabbitmqctl to delete all the queues.
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Get Character value from KeyCode in JavaScript… then trim
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Readable key names indexed by key code
There are relatively few key codes so I simply listed all the corresponding values in a static array so I could simply convert the number 65 into A using keyboardMap[65]
Not all key codes map to a printa...