title: powershell not able to find software installed in the same script
body: <p>I have written the below powershell script in the userdata section of a AWS windows EC2 stack creation cloudformation script. I am able to install the AWSCLI using the script but the script is not recognizing 'aws s3 cp' command after install cmdlet.
   When I login to the EC2 instance I am able to run the aws s3 cp command sucessfully from the powershell prompt.
  Can anybody tell what I am doing wrong.</p>
  
  <pre><code>{
      "contents":[
          "&lt;powershell&gt; ","\n",
          "$awscliurl = \"https://s3.amazonaws.com/aws-cli/AWSCLI64.msi\"  \n",
          "$awsclidownloadloc = \"C:/Windows/Temp/AWSCLI64.msi\"  \n",
          "(New-Object System.Net.WebClient).DownloadFile($awscliurl, $awsclidownloadloc)   \n",
          "$argstr =  \"/I  C:\\Windows\\Temp\\AWSCLI64.msi  /quiet /L*v   ./awscli-output.log\"  \n",
          "Start-Process msiexec.exe -Wait -ArgumentList $argstr   \n",
          "Start-Process powershell.exe  -RedirectStandardOutput  c:\\s3out.txt  -RedirectStandardError c:\\s3err.out  -Wait -ArgumentList \"aws s3 cp s3://mybucket/myfile.exe  c:\\myfile.exe\"  \n",
          "&lt;/powershell&gt;"
      ]
  }
  </code></pre>
  
  <p>When I look at s3err.out I see the below</p>
  
  <p>aws : The term 'aws' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the 
  spelling of the name, or if a path was included, verify that the path is correct and try again.
  At line:1 char:1
  + aws s3 cp s3://mybucket/myfile.exe c:\myfile.exe
  + ~~~
      + CategoryInfo          : ObjectNotFound: (aws:String) [], CommandNotFoundException
      + FullyQualifiedErrorId : CommandNotFoundException</p>