什么是automatic variable?

看代码符号$?搞不清楚是什么?

看代码.

$share = Get-WmiObject -Class Win32_Share -ComputerName $Server.name -Credential $credentials -Filter "Description=‘Default share‘"

if($?)
{
   "command succeeded"
   $share | Foreach-Object {...}
}
else
{
   "command failed"
}

找到定义如下:

Contains the execution status of the last operation. It contains TRUE if the last operation succeeded and FALSE if it failed.

Reference

==================

about_Automatic_Variables

https://technet.microsoft.com/en-us/library/hh847768.aspx

什么是automatic variable?

原文：http://www.cnblogs.com/awpatp/p/5773465.html