touch equivalent in powershell code example

Example 1: touch in windows powershell

touch in linux == ni in powershell
//ni is alias of New-Item
so you just need : 
ni newFile.txt

Example 2: touch in windows powershell

in powershell not cmd 
you can use 
#-------------------
ni itemname
#------------------
ni is alias for New-Item, type help New-Item for the documentation
thanks