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Run cron job only if it isn't already running
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Use flock. It's new. It's better.
Now you don't have to write the code yourself. Check out more reasons here: https://serverfault.com/a/82863
/usr/bin/flock -n /tmp/my.lockfile /usr/local/bin/my_script
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How to print HTML content on click of a button, but not the page? [duplicate]
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I like that you don't need to open a new window and all that crap.
– Robusto
Apr 16 '17 at 22:01
1
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Exploitable PHP functions
...()
require()
require_once()
$_GET['func_name']($_GET['argument']);
$func = new ReflectionFunction($_GET['func_name']); $func->invoke(); or $func->invokeArgs(array());
List of functions which accept callbacks
These functions accept a string parameter which could be used to call a function of...
Converting Dictionary to List? [duplicate]
...wer due to explaining what I was doing wrong. As you can tell, I'm fairly knew to Python and any explanations are greatly appreciated. Cheers!
– Federer
Nov 5 '09 at 9:46
2
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SQL JOIN and different types of JOINs
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There are relatively new LATERAL JOIN .. SELECT * FROM r1, LATERAL fx(r1)
– Pavel Stehule
Jul 30 '13 at 11:52
13
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How to include a Font Awesome icon in React's render()
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If you are new to React JS and using create-react-app cli command to create the application, then run the following NPM command to include the latest version of font-awesome.
npm install --save font-awesome
import font-awesome to you...
Alarm Manager Example
...ystemService(Context.POWER_SERVICE);
PowerManager.WakeLock wl = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "");
wl.acquire();
// Put here YOUR code.
Toast.makeText(context, "Alarm !!!!!!!!!!", Toast.LENGTH_LONG).show(); // For example
wl.release();
}...
Repeat string to certain length
...ing to about 40% more bytecode instructions.
Note: these examples use the new-ish // operator for truncating integer division. This is often called a Python 3 feature, but according to PEP 238, it was introduced all the way back in Python 2.2. You only have to use it in Python 3 (or in modules th...
Replace selector images programmatically
...the StateListDrawable has already been defined. You can, however, define a NEW one through code:
StateListDrawable states = new StateListDrawable();
states.addState(new int[] {android.R.attr.state_pressed},
getResources().getDrawable(R.drawable.pressed));
states.addState(new int[] {android.R.at...
Conditional HTML Attributes using Razor MVC3
... to use Html helper. In your view it can be look like:
@{
var htmlAttr = new Dictionary<string, object>();
htmlAttr.Add("id", strElementId);
if (!CSSClass.IsEmpty())
{
htmlAttr.Add("class", strCSSClass);
}
}
@* ... *@
@Html.TextBox("somename", "", htmlAttr)
If this way will be use...