Compare LastWriteTime in an 'if' statement in PowerShell -

i want run below script every 10 minutes.

i have file , file b. every 10 minutes, want check if file newer file b. if so, want set lastwritetime of file b current date. believe if statement wrong... how can fix it?

$a = get-item c:\users\testuser\desktop\test.xml | select lastwritetime  $b = get-item c:\users\testuser\desktop\test.swf | select lastwritetime  if($a < $b) {     $b.lastwritetime = (get-date) } 

i think in above example, i'm setting variable $b current date...i want set lastwritetime of actual file current date.

you similar following change last write time of file:

$file1 = get-childitem -path "c:\temp\test1.txt" $file2 = get-childitem -path "c:\temp\test2.txt"  #system.io namespace of file class in .net , getlastwritetime/setlastwritetime methods of class. if ([system.io.file]::getlastwritetime($file1) -lt [system.io.file]::getlastwritetime($file2))     {         write-output  "file1 lastwritetime less file2, setting lastwritetime on file2."             ([system.io.file]::setlastwritetime($file2,(get-date)))     } else     {         write-output "file1 lastwritetime not less file2 lastwritetime."     } 

more information on namespace, .net class, , associated methods used in above code can found here.

hope helps!