Document Command Path Precedence

Addresses #4105

Author: TravisEz13

reference/5.1/Microsoft.PowerShell.Core/About/about_Command_Path_Precedence.md

@@ -0,0 +1,69 @@
+---
+ms.date:  05/17/2019
+schema:  2.0.0
+locale:  en-us
+keywords:  powershell,cmdlet
+title:  about_Execution_Search
+---
+
+# Command Path Precedence
+
+## Short description
+
+When you run command by path,
+such as `./myScript.ps1` PowerShell has a process that it uses to search for the script.
+This document describes how PowerShell does that search.
+
+## Long description
+
+### Limiting the search to the current directory
+
+To tell PowerShell that you want to search for the script in the current folder,
+you should specify the prefix `.\`.
+This will limit the search for commands to files in the current folder.
+Without this prefix,
+other PowerShell syntax may conflict and there are few guarantees that the file will be found.
+
+### Using Wildcards in Execution
+
+> [!NOTE]
+> Using wildcard characters is sometimes referred to as *globbing*.
+
+You may use wildcards in command execution.
+PowerShell supports the following wildcards.
+
+| Wildcard character | Description                                                         | Example  | Matches          | Does not match |
+|--------------------|---------------------------------------------------------------------|----------|------------------|----------------|
+| *                  | Matches zero or more characters, starting at the specified position | a*       | A, ag, Apple     |                |
+| ?                  | Matches any character at the specified position                      | ?n       | An, in, on       | ran            |
+| [ ]                | Matches a range of characters                                       | [a-l]ook | book, cook, look | took           |
+| [ ]                | Matches the specified characters                                    | [bc]ook  | book, cook       | look           |
+
+### Path Precedence
+
+PowerShell will execute a file that has a wildcard match, before a literal match.
+
+For example, consider a directory with the following files:
+
+```
+a.ps1
+[a1].ps1
+```
+
+Then, you are in PowerShell and have `Set-Location` to this folder.
+You run `[a1].ps1`, the file `a.ps1`,
+even though the file `[a1].ps1` matches this based on the literal match.
+
+However, if the directory looked like this:
+
+```
+b.ps1
+[a1].ps1
+```
+
+and you execute `[b1].ps1` because there is no literal match,
+but `b.ps1` matches based on the wildcard, `b.ps1` will be executed.
+
+## See also
+
+- [about_Command_Precedence](about_Command_Precedence.md)

reference/5.1/Microsoft.PowerShell.Core/About/about_Command_Precedence.md

@@ -48,6 +48,8 @@ following rules.
   .\FindDocs.ps1
   ```
 
+For additional details, see [Command Path Precedence](about_Command_Path_Precedence.md)
+
 - If you do not specify a path, PowerShell uses the following precedence order
   when it runs commands: