system("ping $_ >/root/scripts/log.txt");
The above code works for me in Linux

But in windows, the simililar code does not work 
system("ping $_ >c:\temp\log.txt");

By using, single cotes, i can use it like
system('ping 10.56.1.1 >c:\temp\log.txt');

But my scripts requires this command to be used in a loop, but this doesn't permit to use scalar variable. 

system('ping $_ >c:\temp\log.txt'); 
So this command doesnt work