How do I assign a null value to a variable in PowerShell

Question

I want to assign a null value to a variable called  dec  but it gives me errors  Here is my code   import-module activedirectory  domain    domain example com   dec   null Get-ADComputer -Filter  Description -eq  dec

User · Answer

If the goal simply is to list all computer objects with an empty description attribute try this  import-module activedirectory    domain    domain example com   Get-ADComputer -Filter     -Properties Description   where      Description -eq  null

User · Answer

Use  dec     null  From the documentation       null is an automatic variable that contains a NULL or empty value  You can use this variable to represent an absent or undefined value in commands and scripts       PowerShell treats  null as an object with a value  that is  as an explicit placeholder  so you can use  null to represent an empty value in a series of values

User · Answer

These are automatic variables  like  null   true   false etc   about Automatic Variables  see https   technet microsoft com en-us library hh847768 aspx f 255 amp MSPPError -2147217396      NULL    null is an automatic variable that contains a NULL or empty   value  You can use this variable to represent an absent or undefined   value in commands and scripts       Windows PowerShell treats  null as an object with a value  that is  as   an explicit placeholder  so you can use  null to represent an empty   value in a series of values       For example  when  null is included in a collection  it is counted as   one of the objects   C  PS gt   a     dir    null    pdf  C  PS gt   a count 3       If you pipe the  null variable to the ForEach-Object cmdlet  it   generates a value for  null  just as it does for the other objects   PS C  ps-test gt    dir    null    pdf    Foreach   Hello   Hello Hello Hello       As a result  you cannot use  null to mean  no parameter value   A   parameter value of  null overrides the default parameter value       However  because Windows PowerShell treats the  null variable as a   placeholder  you can use it scripts like the following one  which   would not work if  null were ignored    calendar      null   null     Meeting      null   null     Team Lunch      null   days   Sunday   Monday   Tuesday   Wednesday   Thursday   Friday   Saturday   currentDay   0  foreach  day in  calendar        if  day    ne  null                 Appointment on    days  currentDay     day              currentDay           output   Appointment on Tuesday  Meeting Appointment on Friday  Team lunch

[powershell] How do I assign a null value to a variable in PowerShell?

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