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PHP exec() vs system() vs passthru()
...g.
There are also proc_open() and popen() which allow you to interactively read/write streams with an executing command.
Add "2>&1" to the command string if you also want to capture/display error messages.
Use escapeshellcmd() to escape command arguments that may contain problem characters.
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How to kill all processes with a given partial name? [closed]
...rd 3rd party library shares your process name, or that in the time between read and execute kill -9, the processid had changed to something else, and now you've accidentally ended some random process you didn't intend to.
But, if you understand the risks and control for them with very unique nam...
Passing a String by Reference in Java?
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Just keep in mind that StringBuilder is not thread safe. In multithreaded environment use the StringBuffer class or manually take care of synchronization.
– Boris Pavlović
Aug 13 '09 at 8:59
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The best way to remove duplicate values from NSMutableArray in Objective-C?
...ed to make a copy of the entire array), and is in my opinion a little more readable.
Note that in either case, checking to see if an item is already included in the target array (using containsObject: in my example, or indexOfObject:inRange: in Jim's) doesn't scale well for large arrays. Those chec...
Create a GUID in Java
...iePet Eh, if you're that paranoid, and you got access to the list of the already-used IDs when creating a new one, you just generate new ones in a while until you got one that isn't inside your list :p
– Nyerguds
Jul 5 '16 at 13:11
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How to split a string, but also keep the delimiters?
...cter before ; or after ;.
Hope this helps.
EDIT Fabian Steeg comments on Readability is valid. Readability is always the problem for RegEx. One thing, I do to help easing this is to create a variable whose name represent what the regex does and use Java String format to help that. Like this:
stat...
How many String objects will be created when using a plus sign?
...ole.Out.WriteLine(Object.ReferenceEquals(result, RESULT));
Console.ReadKey();
}
}
In the case where Strings are concatenated in a loop (or otherwise dynamically), you end up with one extra string per concatenation. For instance, the following creates 12 string instances: 2 constants +...
How to create a directory if it doesn't exist using Node.js?
...ory if it doesn't exist.
It should have full permission for the script and readable by others.
17 Answers
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PostgreSQL error: Fatal: role “username” does not exist
...ting system user does not exist. You'd need to adapt your strategy there.
Read about database roles and client authentication in the manual.
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What did MongoDB not being ACID compliant before v4 really mean?
...ment is
Atomic: it either fully completes or it does not
Consistent: no reader will see a "partially applied" update
Isolated: again, no reader will see a "dirty" read
Durable: (with the appropriate write concern)
What MongoDB doesn't have is transactions -- that is, multiple-document updates ...