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What's the difference between [ and [[ in Bash? [duplicate]
...tespace more intuitively. For example, with [ you have to write
if [ -f "$file" ]
to correctly handle empty strings or file names with spaces in them. With [[ the quotes are unnecessary:
if [[ -f $file ]]
Because it is a syntactical feature, it lets you use && and || operators for boole...
iOS Simulator failed to install the application
...dle versions string, short (CFBundleShortVersionString) in the -Info.plist file. Looks like iOS 7 doesn't like an empty value for the build number. I had a script that auto increments the bundle number by 1 every time I build the project so this field was empty. I just assigned a dummy value there t...
Storing time-series data, relational or non?
...ce Charts Like This, six keystrokes after receiving a raw monitoring stats file from the customer, using a single SELECT command. Notice the mix-and-match; OS and server on the same chart; a variety of Pivots. Of course, there is no limit to the number of stats matrices, and thus the charts. (Used ...
How to make a class JSON serializable
...a about the expected output? For example, will this do?
>>> f = FileItem("/foo/bar")
>>> magic(f)
'{"fname": "/foo/bar"}'
In that case you can merely call json.dumps(f.__dict__).
If you want more customized output then you will have to subclass JSONEncoder and implement your ...
MySQL root password change
... completely removing and reinstalling mysql (including removing the my.cnf file) and still no luck. Does anyone have any suggestions on what I can do next?
...
Can a CSS class inherit one or more other classes?
...nt to modify the design/HTML it provides, but can't change the inbuilt css files in that lib ? There I would need some kind of inheritance in css classes.
– Shivam
Feb 4 '17 at 11:54
...
How do I find out my python path using python?
...viron['PYTHONPATH'].split(os.pathsep)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "C:\Users\martin\AppData\Local\Programs\Python\Python36-32\lib\os.py", line 669, in __getitem__
raise KeyError(key) from None
KeyError: 'PYTHONPATH'
>>>
...
Difference between ProcessBuilder and Runtime.exec()
...ommand, null, null);
}
public Process exec(String command, String[] envp, File dir)
throws IOException {
if (command.length() == 0)
throw new IllegalArgumentException("Empty command");
StringTokenizer st = new StringTokenizer(command);
String[] cmdarray = new String[st.coun...
How do I draw a shadow under a UIView?
...on also requires adding #import <QuartzCore/QuartzCore.h>" to the .h file.
– MusiGenesis
Mar 22 '11 at 13:39
26
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How do I get the current version of my iOS project in code?
...oject/app as an NSString object without having to define a constant in a file somewhere. I don't want to change my version value in 2 places.
...