Putting the whole file into an array is wasteful of time and memory. What will happen if it is a 10 GB file?
in reply to script not working
You can do just as easy the following:
It is faster and uses less memory.
open my $file1, '<', './file1.txt';
my $secondline = <$file1>;
my $fivefirstfile1= substr($secondline, 0, 5);
A program should be light and agile, its subroutines connected like a string of pearls. The spirit and intent of the program should be retained throughout. There should be neither too little or too much, neither needless loops nor useless variables, neither lack of structure nor overwhelming rigidity." - The Tao of Programming, 4.1 - Geoffrey James
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