What does $_ mean in PowerShell? - Stack Overflow
Feb 1, 2016 · $_ is a variable created by the system usually inside block expressions that are referenced by cmdlets that are used with pipe such as Where-Object and ForEach-Object. But …
Why do we use _ in variable names? - Stack Overflow
Aug 1, 2011 · In C# the _ variable style is a legacy thing (can't exactly remember where it came from, some old reference book do mention.) It is even use in view like _ abc.cshtml, but the …
Defining and using a variable in batch file - Stack Overflow
Consider also using SETX - it will set variable on user or machine (available for all users) level though the variable will be usable with the next opening of the cmd.exe ,so often it can be …
What does the @ symbol before a variable name mean in C#?
Mar 18, 2016 · Firstly, it allows you to use a reserved keyword as a variable like this: int @int = 15; The second option lets you specify a string without having to escape any characters. For …
SQL Server SELECT INTO @variable? - Stack Overflow
Jan 8, 2015 · I found your question looking for a solution to the same problem; and what other answers fail to point is a way to use a variable to change the name of the table for every …
MySQL: @variable vs. variable. What's the difference?
In MySQL, @variable indicates a user-defined variable. You can define your own. SET @a = 'test'; SELECT @a; Outside of stored programs, a variable, without @, is a system variable, …
How to get text and a variable in a messagebox - Stack Overflow
Dec 25, 2011 · As has been suggested, using the string.format method is nice and simple and very readable. In vb.net the " + " is used for addition and the " & " is used for string …
Difference between %variable% and !variable! in batch file
The value of the !_var! variable is evaluated as late as possible while the %_var% variable works just as before. Delayed Expansion will cause variables within a batch file to be expanded at …
JavaScript OR (||) variable assignment explanation - Stack Overflow
In summary, this technique is taking advantage of a feature of how the language is compiled. That is, JavaScript "short-circuits" the evaluation of Boolean operators and will return the value …
When should I use the dollar symbol ($) in a variable name?
A variable's name can be any legal identifier — an unlimited-length sequence of Unicode letters and digits, beginning with a letter, the dollar sign "$", or the underscore character "_". The …