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What is the best way to ensure only one instance of a Bash script is running? [duplicate]
...ased my lockable script boilerplate (originally available at my wiki page, nowadays available as gist). Transforming that into one-instance-per-user is trivial. Using it you can also easily write scripts for other scenarios requiring some locking or synchronization.
Here is the mentioned boilerplat...
What's the difference between Perl's backticks, system, and exec?
...ere you want to fetch STDOUT, STDERR or the return code, you can use well known standard modules like IPC::Open2 and IPC::Open3.
Example:
use IPC::Open2;
my $pid = open2(\*CHLD_OUT, \*CHLD_IN, 'some', 'cmd', 'and', 'args');
waitpid( $pid, 0 );
my $child_exit_status = $? >> 8;
Finally, IPC:...
How to calculate the difference between two dates using PHP?
...ects can be compared using comparison operators.
$date1 = new DateTime("now");
$date2 = new DateTime("tomorrow");
var_dump($date1 == $date2); // bool(false)
var_dump($date1 < $date2); // bool(true)
var_dump($date1 > $date2); // bool(false)
...
Which Android IDE is better - Android Studio or Eclipse? [closed]
.... Which IDE should I use - Android Studio or Eclipse sdk?
I would like to know which one is better.
5 Answers
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How to check if a Ruby object is a Boolean
...String".boolean?
=> false
>> 1.boolean?
=> false
>> Time.now.boolean?
=> false
>> nil.boolean?
=> false
>> true.boolean?
=> true
>> false.boolean?
=> true
>> (1 ==1).boolean?
=> true
>> (1 ==2).boolean?
=> true
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Merging between forks in GitHub
...o my fork. Then the original repository merged my changes and some others. Now, I want to merge those changes I'm missing. I tried a simple pull followed by push, but this yield my commits in duplicate. What's the best way to do it?
...
Best/Most Comprehensive API for Stocks/Financial Data [closed]
...
Link is now dead
– QHarr
Oct 13 '18 at 8:41
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When are you truly forced to use UUID as part of the design?
I don't really see the point of UUID . I know the probability of a collision is effectively nil , but effectively nil is not even close to impossible.
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Is there a way that I can check if a data attribute exists?
... been set with the .data() method, e.g. $('#dataTable').data('timer', Date.now()). It seems the OP wants to check that the actual data attribute is there. @niiru's solution (or the one you offer in a comment to that solution) is better, in this case.
– Noyo
Dec...
Can I create more than one repository for github pages?
...using custom domain names.
(since April 2013, all username.github.com are now username.github.io)
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