Windows Powershell 执行文件和脚本

象运行可执行文件一样,Powershell运行文件和脚本,也必须使用绝对路径或者相对路径,或者要运行的文件必须定义在可受信任的环境变量中。

关于脚本
脚本和批处理都属于伪可执行文件,它们只是包含了若干命令行解释器能够解释和执行的命令行代码。

执行批处理文件
批处理是扩展名为”.bat”的文本文件,它可以包含任何cmd控制台能够处理的命令。当批处理文件被打开,Cmd控制台会逐行执行每条命令。那Powershell能够直接执行批处理吗?
将下列命令保存为ping.bat

@echo off
echo batch File Test
pause
Dir %windir%/system

然后执行ping
屏幕会打印ping命令帮助,说明调用的ping cmd 而不是ping.bat。
改为:

PS C:\PS> ./ping
batch File Test
Press any key to continue . . .
 Volume in drive C has no label.
 Volume Serial Number is 4E9B-D846

 Directory of C:Windowssystem

2009/06/11 05:21   69,584 avicap.dll
2009/06/11 05:21   109,456 avifile.dll
2009/07/14 05:41   32,816 COMMDLG.DLL
2009/07/14 05:41    2,000 keyboard.drv
2009/06/11 05:42    9,936 lzexpand.dll
2009/06/11 05:21   73,376 mciavi.drv
2009/06/11 05:21   25,264 mciseq.drv
2009/06/11 05:21   28,160 mciwave.drv
2009/07/14 05:41   68,992 MMSYSTEM.DLL
2009/07/14 05:41    1,152 mmtask.tsk
2009/07/14 05:41    2,032 mouse.drv
2009/06/11 05:21   126,912 msvideo.dll
2009/06/11 05:42   82,944 olecli.dll
2009/07/14 05:41   24,064 OLESVR.DLL
2009/07/14 05:41    5,120 SHELL.DLL
2009/07/14 05:41    1,744 sound.drv
2009/06/11 05:25    5,532 stdole.tlb
2009/07/14 05:41    3,360 system.drv
2009/07/14 05:41    4,048 TIMER.DRV
2009/06/11 05:42    9,008 ver.dll
2009/07/14 05:41    2,176 vga.drv
2009/07/14 05:41   12,704 WFWNET.DRV
    22 File(s)  700,380 bytes
    2 Dir(s) 75,927,420,928 bytes free

这时运行的是批处理。

通过cmd进入cmd控制台输入ping发现执行的不是ping命令,而是直接运行ping.bat ,也就是说可以通过.bat 覆盖cmd命令。这种机制很危险,如果有人侵入电脑,并将系统内部命令篡改成自己批处理,那就太悲剧了。 这种命令与脚本的混淆不会发生在powershell中,因为powershell有更安全的机制。

执行VB脚本文件
将下列命令保存为test.vbs

Set wmi = GetObject("winmgmts:")
Set collection = wmi.ExecQuery("select * from Win32_Process")
For Each process in collection
WScript.Echo process.getObjectText_
Next

执行 .\test.vbs 会遍历当前Win32进程,并把每个进程的详细信息通过窗口显示出来。
怎样让VB脚本的通过控制台输出呢?
Wscript //H:CScript
怎样还原VB脚本通过窗口输出呢?
WScript //H:WScript
在powershell中执行VB脚本

PS C:\PS> cscript.exe .test.vbs
Microsoft (R) Windows Script Host Version 5.8
Copyright (C) Microsoft Corporation. All rights reserved.

instance of Win32_Process
{
  Caption = "System Idle Process";
  CreationClassName = "Win32_Process";
  CSCreationClassName = "Win32_ComputerSystem";
  CSName = "test-me-01";
  Description = "System Idle Process";
  Handle = "0";
  HandleCount = 0;
  KernelModeTime = "484113379271";
  Name = "System Idle Process";
  OSCreationClassName = "Win32_OperatingSystem";
  OSName = "Microsoft Windows 7 Enterprise |C:Windows|DeviceHarddisk0Partition2";
  OtherOperationCount = "0";
  OtherTransferCount = "0";
  PageFaults = 0;
  PageFileUsage = 0;
  ParentProcessId = 0;
  PeakPageFileUsage = 0;
  PeakVirtualSize = "0";
  PeakWorkingSetSize = 0;
  Priority = 0;
  PrivatePageCount = "0";
  ProcessId = 0;
  QuotaNonPagedPoolUsage = 0;
  QuotaPagedPoolUsage = 0;
  QuotaPeakNonPagedPoolUsage = 0;
  QuotaPeakPagedPoolUsage = 0;
  ReadOperationCount = "0";
  ReadTransferCount = "0";
  SessionId = 0;
  ThreadCount = 2;
  UserModeTime = "0";
  VirtualSize = "0";
  WindowsVersion = "6.1.7601";
  WorkingSetSize = "24576";
  WriteOperationCount = "0";
  WriteTransferCount = "0";
};

执行powershell脚本
Powershell拥有自己的脚本,扩展名为“.ps1”

PS C:\PS> echo "dir;Get-PSProvider;help dir" >test.ps1
PS C:\PS> Get-Content ./test.ps1
dir;Get-PSProvider;help dir
PS C:\PS> ./test.ps1初次执行脚本时,可能会碰到一个异常:
File ” C:\PS\test.ps1″ cannot be loaded because the
execution of scripts is disabled on this system. Please see
“get-help about_signing” for more details.
At line:1 char:10
+ .test.ps1 <<<<

这是powershell的默认安全设置禁用了执行脚本,要启用这个功能需要拥有管理员的权限。

开启:set-executionpolicy remotesigned

关闭:Set-ExecutionPolicy Restricted

Powershell调用入口的优先级
别名:控制台首先会寻找输入是否为一个别名,如果是,执行别名所指的命令。因此我们可以通过别名覆盖任意powershell命令,因为别名的优先级最高。

函数:如果没有找到别名,会继续寻找函数,函数类似别名,只不过它包含了更多的powershell命令。因此可以自定义函数扩充cmdlet 把常用的参数给固化进去。

命令:如果没有找到函数,控制台会继续寻找命令,即cmdlet,powershell的内部命令。

脚本:没有找到命令,继续寻找扩展名为“.ps1”的Powershell脚本。

文件:没有找到脚本,会继续寻找文件,如果没有可用的文件,控制台会抛出异常。

The term ‘now' is not recognized as the name of a cmdlet, function, script file, or operable program. Chec
g of the name, or if a path was included, verify that the path is correct and try again.
At line:1 char:4
+ now <<<<
+ CategoryInfo : ObjectNotFound: (now:String) [], CommandNotFoundException
+ FullyQualifiedErrorId : CommandNotFoundException

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