Official product documentation for PowerShell. What is PowerShell? Available editions, tools, and technology that supports PowerShell. Connect with other PowerShell users. Communicate with the …

2010年11月22日 · In PowerShell, a dollar sign preceding a name indicates a variable. The symbols in question are just special cases of variables provided by the PowerShell environment.

PowerShell is a cross-platform (Windows, Linux, and macOS) automation and configuration tool/framework that works well with your existing tools and is optimized for dealing with structured …

2019年1月7日 · Another way of looking at PowerShell’s $_ is purely as a variable. After all, the dollar sign is PowerShell’s way of introducing any variable, not just this special ‘In this pipeline’ item.

2023年10月30日 · This guide provided a comprehensive deep dive on how $ works under the hood, patterns for utilizing it, performance implications, common mistakes to avoid, and best practices for …

2025年4月26日 · PowerShell, like many programming and scripting languages, includes a set of special variables that are reserved for specific purposes. These variables often start with a dollar sign ($) and …

2010年8月16日 · $_ is an alias for automatic variable $PSItem (introduced in PowerShell V3.0; Usage information found here) which represents the current item from the pipe. PowerShell (v6.0) online …

2024年8月2日 · This chapter focuses on finding and launching PowerShell and solving the initial pain points that new users experience with PowerShell. Follow along and walk through the examples in …

2019年12月2日 · Runs the pipeline before it in the background, in a PowerShell job. This operator acts similarly to the Unix control operator ampersand (&), which runs the command before it …

2025年12月1日 · PowerShell is a command-line shell and a scripting language used for automation. Similar to other shells, like bash on Linux or the Windows Command Shell (cmd.exe), PowerShell lets …