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How to return a string value from a Bash function
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18 Answers
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Why does NULL = NULL evaluate to false in SQL server
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18 Answers
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Why declare a struct that only contains an array in C?
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184
It allows you to pass the array to a function by value, or get it returned by value from a fun...
jQuery Set Select Index
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NOTE: answer is dependent upon jQuery 1.6.1+
$('#selectBox :nth-child(4)').prop('selected', true); // To select via index
$('#selectBox option:eq(3)').prop('selected', true); // To select via value
Thanks for the comment, .get won't work since it returns a ...
How do I combine two data-frames based on two columns? [duplicate]
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139
See the documentation on ?merge, which states:
By default the data frames are merged on the c...
Conditionally Remove Dataframe Rows with R [duplicate]
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311
Logic index:
d<-d[!(d$A=="B" & d$E==0),]
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Force CloudFront distribution/file update
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push multiple elements to array
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When using most functions of objects with apply or call, the context parameter MUST be the objec...
Rails :include vs. :joins
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It appears that the :include functionality was changed with Rails 2.1. Rails used to do the j...
Redirect Windows cmd stdout and stderr to a single file
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1111
You want:
dir > a.txt 2>&1
The syntax 2>&1 will redirect 2 (stderr) to 1 ...