How to get list of all AD users in AD group

To list all members of one AD security group:

Get-AdGroupMember -identity "Domain Admins" | get-aduser -Properties * | ft name, samaccountname, whencreated

To list all sec. groups of one AD user (member of what groups):

Get-ADUser -Identity [someone'-samaccountname] -Properties memberof|Select-Object -ExpandProperty memberof

To copy all groups from one AD user to other:

Get-ADUser -Identity [source-user-samaccountname] -Properties memberof|Select-Object -ExpandProperty memberof|Add-ADGroupMember -Members [target-user-samaccountname]

# all groups of [source-user-samaccountname] will be copied to [target-user-samaccountname]