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How to get the first line of a file in a bash script?
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head takes the first lines from a file, and the -n parameter can be used to specify how many lines should be extracted:
line=$(head -n 1 filename)
share
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Assign output to variable in Bash
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Same with something more complex...getting the ec2 instance region from within the instance.
INSTANCE_REGION=$(curl -s 'http://169.254.169.254/latest/dynamic/instance-identity/document' | python -c "import sys, json; print json.load(sys.stdin)['region']")
echo $INSTANCE_REGION
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ProcessBuilder: Forwarding stdout and stderr of started processes without blocking the main thread
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From the moment, the InputStream has ended, it will end too.
– asgoth
Jan 4 '13 at 22:03
7
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What happens when a duplicate key is put into a HashMap?
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Thanks from me as well! I did have to add a "remove" method to it to perform the same functionality as a normal Map but worked great!
– JGlass
Oct 16 '18 at 17:20
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Best practice for embedding arbitrary JSON in the DOM?
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Thank you. The quote from the spec has convinced me.
– Ben Lee
Feb 16 '12 at 23:25
17
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Why does !{}[true] evaluate to true in JavaScript?
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Because
{}[true]
evaluates to undefined, and !undefined is true.
From @schlingel:
true is used as key and {} as hash map. There doesn't exist an property with the key true so it returns undefined. Not undefined is true, as expected.
Console session (Node.js [0.10.17]):
> {}[true]
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Static method in a generic class?
...e, which you need if the compiler can't infer the type of the return value from the contaxt in which the method is called. In other words, if the compiler allows Clazz.doIt(object), then do that.
– skaffman
Jun 1 '09 at 19:57
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Get current controller in view
...er makes a request for ControllerA, and ControllerA renders a partial view from ControllerB, your solution would return ControllerB's name, while Nicholas Sizer solution would return ControllerA's name.
– Thomas C. G. de Vilhena
Apr 8 '14 at 22:01
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Bad value X-UA-Compatible for attribute http-equiv on element meta
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so how can i fix the problem from w3c validator..may i remove the tag?
– Krish
Feb 3 '14 at 10:00
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How do I write the 'cd' command in a makefile?
...a sub-process shell, and affects neither make nor the shell you're working from.
If you're looking to perform more tasks within some_directory, you need to add a semi-colon and append the other commands as well. Note that you cannot use newlines as they are interpreted by make as the end of the rul...