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$ cat pm_1049671_temp.txt
a b c
d e f
g h i

$ perl -Mstrict -Mwarnings -le '
    my @numbers;
...
    print "@numbers";
' pm_1049671_temp.txt
a b c d e f g h i

$ cat pm_1049671_2temp.txt
j k l
m n o
p q r

$ perl -Mstrict -Mwarnings -le '
    my @numbers;
...
    print "@numbers";
' pm_1049671_temp.txt pm_1049671_2temp.txt
a b c d e f g h i j k l m n o p q r

$ perl -Mstrict -Mwarnings -le '
    print "@ARGV";   
' pm_1049671_temp.txt pm_1049671_2temp.txt
pm_1049671_temp.txt pm_1049671_2temp.txt