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Safely limiting Ansible playbooks to a single machine?
...t; {"failed": true}
msg: Single host check failed.
FATAL: all hosts have already failed -- aborting
Run playbook on single host
$ ansible-playbook user.yml --limit=alice
PLAY [all] ****************************************************************
TASK: [Check for single host] *******************...
Random row selection in Pandas dataframe
...he tip on difference. Though, I still prefer writing the slicing so that I read it as indices "not in the index of my sample". Is there a performance increase with difference()?
– ryanjdillon
May 4 '18 at 7:50
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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 do you create optional arguments in php?
...ent optional parameter. For example, for the date() function, the manual reads:
6 Answers
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Passing a String by Reference in Java?
...
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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Rollback to last git commit
...t answer with 36 up votes. I've just lost a days work to this... because I read the answer not the comment. This is not the correct answer to the question!
– Chris Nevill
Aug 7 '15 at 11:13
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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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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...
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 +...
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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