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How to check if a file is empty in Bash?

I have a file called diff.txt. Want to check if it is empty. Did something like this but couldn't get it working. 10 Answe...
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Scala best way of turning a Collection into a Map-by-key?

If I have a collection c of type T and there is a property p on T (of type P , say), what is the best way to do a map-by-extracting-key ? ...
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How to set Oracle's Java as the default Java in Ubuntu?

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SQLAlchemy: print the actual query

... being maintained on the sqlalchemy documentation. To get the statement as compiled to a specific dialect or engine, if the statement itself is not already bound to one you can pass this in to compile(): print(statement.compile(someengine)) or without an engine: from sqlalchemy.dialects import post...
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How to wait for a keypress in R?

...eUploader: { brandingHtml: "Powered by \u003ca href=\"https://imgur.com/\"\u003e\u003csvg class=\"svg-icon\" width=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454 46.2665 7.94324 4...
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In SQL, how can you “group by” in ranges?

... Better answer at stackoverflow.com/questions/14730380/… – Thunder May 27 '15 at 7:24 1 ...
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http to https apache redirection

...tualHost *:80> ServerName mysite.example.com Redirect permanent / https://mysite.example.com/ </VirtualHost> <VirtualHost _default_:443> ServerName mysite.example.com DocumentRoot /usr/local/apache2/htdocs SSLEngine On # etc... </VirtualHost> Then do: /etc/init...
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What is compiler, linker, loader?

... data stack are created, register gets initialized. Little Extra info :- http://www.geeksforgeeks.org/memory-layout-of-c-program/ , you can see the memory layout over there. share | improve thi...
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How can I export the schema of a database in PostgreSQL?

...computer broke down but fortunately I backed up the folder C:\Program Files\PostgreSQL. 8 Answers ...
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How to find the Windows version from the PowerShell command line

... When I run winver it shows me version 1607. But the powershell command above does not give 1607. Where do I get this "1607" number in Powershell? – CMCDragonkai Dec 10 '16 at 8:01 ...