#!/usr/bin/perl -w
my $a; if ($a eq 'fff'){ } above line gives the error Use of uninitialized value in string eq at t.pl line 6. but when -w not used in top line it works perfect what the -w really does
#!/usr/bin/perl -w
my $a; if ($a eq 'fff'){ } above line gives the error Use of uninitialized value in string eq at t.pl line 6. but when -w not used in top line it works perfect what the -w really does