If (<FH>) ::: if doesn't not fill the $_ variable with contents of files first line automatically. While (<FH>) ::: while do fill the $_ to content of the files first line automatically.
i.e
open FH, "name.txt" or die "cant open";
if (<FH>){
print "$_";
}
prints nothing
If we change if to while $_ is set to first line of the file... how
can this happen
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