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copied!<p>Try this function coming from <a href="http://powershell.com/cs/" rel="nofollow">PowerShell.com</a> PowerTip it illustrate the usage of <code>Invoke-Expression</code>.</p> <pre><code>function Call { $command = $Args -join " " $command += " 2>&1" $result = Invoke-Expression($command) $result | %{$e=""}{ if( $_.WriteErrorStream ) {$e += $_ } else {$_} }{Write-Warning $e} } </code></pre> <p>That gives :</p> <pre><code>cd "${env:ProgramFiles(x86)}\Microsoft Visual Studio 10.0\Common7\IDE" call .\devenv.exe /command "`"File.BatchNewTeamProject C:\stuff\Project51.xml`" </code></pre> <p>--- Edit ---</p> <p>There are many things to say here. </p> <p><strong>First</strong> you can find a good help with "about" files try :</p> <p>Get-help about-*</p> <p>On the subject you are interested you've got:</p> <pre><code>Get-help about_Quoting_Rules Get-Help about_Special_Characters Get-Help about_Escape_Characters Get-Help about_Parameters </code></pre> <p><strong>Second</strong> <code>CD, DIR, MD</code> works, but they are just aliases on CmdLets which takes different arguments.</p> <p><strong>Third</strong> to get environment variable it's no longer <code>%systemroot%</code> it's <code>$env:systemroot</code>.</p> <p><strong>Fourth</strong> to start an executable file from powershell you can just type the name of the exe :</p> <pre><code>PS> notepad c:\temp\test.txt </code></pre> <p>The command line is first interpreted by powerShell so now if you write :</p> <pre><code>PS> "C:\Windows\System32\notepad.exe" C:\Windows\System32\notepad.exe </code></pre> <p>It just interpret it as a string. So you can use the & operator and write </p> <pre><code>PS> & "C:\Windows\System32\notepad.exe" c:\test.txt </code></pre> <p>It works but :</p> <pre><code>PS> $a = "C:\Windows\System32\notepad.exe c:\test.txt" PS> & $a </code></pre> <p>Fails and </p> <pre><code>PS> $a = "C:\Windows\System32\notepad.exe c:\test.txt" PS> Invoke-Expression $a </code></pre> <p>Works</p>

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