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How to check if a variable is set in Bash

variablesbashshell
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What is the difference between the `=` and `==` operators and what is `===`? (Single, double, and triple equals)

javascriptequalityassignment-operatoroperators
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CanvasContext2D drawImage() issue [onload and CORS]

javascriptcanvashtml5-canvas
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The need for parentheses in macros in C

c#c-preprocessormacrosparentheses
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returning a local variable from function in C

c#local-variablespointers
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