DIfference between system and back tick

[swayam panda]

Hi All,

What is the difference between 

foreach ( system ls) {
 if (/1.pl/) {
  print ;}}
Here the output is all the file of the CWD.



and 

foreach ( ` ls`) {

 if (/1.pl/) {
  print ;}}

Here is output is only 1.pl

Please explain this to me 

Thanks & Regards 
Swayam

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