Outputting and Assigning at the same time

In the previous tip we talked about logging script results, and how you can assign values and at the same time output the assigned values by using parentheses:

 
PS> ($a = Get-Process -Id $pid)

Handles  NPM(K)    PM(K)      WS(K)     CPU(s)     Id  SI ProcessName                                                       
-------  ------    -----      -----     ------     --  -- -----------                                                       
   1595     102   283200     325444      64,56   6436   1 powershell_ise                                                    



PS> $a

Handles  NPM(K)    PM(K)      WS(K)     CPU(s)     Id  SI ProcessName                                                       
-------  ------    -----      -----     ------     --  -- -----------                                                       
   1595     102   283200     325444      64,75   6436   1 powershell_ise                                                    



PS>  
 

The same can be accomplished by using the –OutVariable common parameter:

 
PS> Get-Process -Id $pid -OutVariable b

Handles  NPM(K)    PM(K)      WS(K)     CPU(s)     Id  SI ProcessName                                                       
-------  ------    -----      -----     ------     --  -- -----------                                                       
   1731     105   290336     341688      66,66   6436   1 powershell_ise                                                    



PS> $b

Handles  NPM(K)    PM(K)      WS(K)     CPU(s)     Id  SI ProcessName                                                       
-------  ------    -----      -----     ------     --  -- -----------                                                       
   1731     105   290336     341688      66,92   6436   1 powershell_ise                                                    



PS>  
 

And Tee-Object is a third approach:

 
PS> Get-Process -Id $pid | Tee-Object -Variable c

Handles  NPM(K)    PM(K)      WS(K)     CPU(s)     Id  SI ProcessName                                                       
-------  ------    -----      -----     ------     --  -- -----------                                                       
   1759     109   292300     343644      71,53   6436   1 powershell_ise                                                    



PS> $c

Handles  NPM(K)    PM(K)      WS(K)     CPU(s)     Id  SI ProcessName                                                       
-------  ------    -----      -----     ------     --  -- -----------                                                       
   1759     109   292300     343644      71,69   6436   1 powershell_ise                                                    



PS>  
 

Since this is using the pipeline, it is much slower. When you avoid the pipeline, performance is better:

 
PS> Tee-Object -InputObject (Get-Process -Id $pid) -Variable d

Handles  NPM(K)    PM(K)      WS(K)     CPU(s)     Id  SI ProcessName                                                       
-------  ------    -----      -----     ------     --  -- -----------                                                       
   1761     111   294568     345268      74,31   6436   1 powershell_ise                                                    



PS> $d

Handles  NPM(K)    PM(K)      WS(K)     CPU(s)     Id  SI ProcessName                                                       
-------  ------    -----      -----     ------     --  -- -----------                                                       
   1761     111   294568     345268      74,59   6436   1 powershell_ise                                                    



PS>
 

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