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Execute command without keeping it in history [closed]
I want to execute some commands but don't want to store them in the command history. So that nobody will be able to search it in the .bash_history file.
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What is __pycache__?
...preter compiles it to bytecode first (this is an oversimplification) and stores it in the __pycache__ folder. If you look in there you will find a bunch of files sharing the names of the .py files in your project's folder, only their extensions will be either .pyc or .pyo. These are bytecode-compile...
Java exception not caught?
I have a small theoretical problem with try-catch constructions.
6 Answers
6
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Why can't R's ifelse statements return vectors?
I've found R's ifelse statements to be pretty handy from time to time. For example:
9 Answers
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(Built-in) way in JavaScript to check if a string is a valid number
...able (including a string) is a number, check if it is not a number:
This works regardless of whether the variable content is a string or number.
isNaN(num) // returns true if the variable does NOT contain a valid number
Examples
isNaN(123) // false
isNaN('123') // false
is...
Disable a Button
... a button ( UIButton ) on iOS after it is clicked. I am new to developing for iOS but I think the equivalent code on objective - C is this:
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How to terminate script execution when debugging in Google Chrome?
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In Chrome, there is "Task Manager", accessible via Shift+ESC or through
Menu → More Tools → Task Manager
You can select your page task and end it by pressing "End Process" button.
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Java Replacing multiple different substring in a string at once (or in the most efficient way)
...ing in the most efficient way.
is there another way other then the brute force way of replacing each field using string.replace ?
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applicationWillEnterForeground vs. applicationDidBecomeActive, applicationWillResignActive vs. appli
...king up i.e. relaunching an app (either through springboard, app switching or URL) applicationWillEnterForeground: is called. It is only executed once when the app becomes ready for use, after being put into the background, while applicationDidBecomeActive: may be called multiple times after launch....
Is errno thread-safe?
...no; so my question is, is it safe to check errno value after some calls or use perror() in multi-threaded code. Is this a thread safe variable? If not, then whats the alternative ?
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