Re: Splitting an array loaded from a file handle.

I think you're confusing yourself by using the term "split" in two different ways - one of which has nothing to do with splitting. You don't "split" a filehandle into an array, but you can slurp it - which is exactly what you're doing above, with the '@l=<FH3>' line. Perhaps what you mean is that you would like to process the array that you've created by slurping, one element (i.e., one line) at a time:

for my $line (@l){
    chomp $line;    # Remove the newline from the end
    print $line . " - processed by 'trenchwar'\n";   # Add a little co
+ntent to each line
}
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Or you could do the same thing by using Perl's implicit iterator, '$_':

for (@l){
    chomp;
    print "$_ - processed by 'trenchwar'\n";
}
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or even by using the 'map' function:

chomp @l;    # Remove the newline from all elements
print map { "$_ - processed by 'trenchwar'\n" } @l;
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I note, by the way, that your script has several doubtful constructs in it:

open (FH3, ">lessons.txt");
### You should *always* check the return from any calls to the system.
open FH3, ">lessons.txt" or die "lessons.txt: $!\n";
### You should also close this filehandle; don't assume that your file
+ has actually
### been written before you do so!
close FH3;

$l="lessons.txt";
open(FH3, $l) || die("Could not open file!");
### Don't create variables that you're only going to use once; just us
+e the value.
### *And* check the return of the call. And don't pre-assume the reaso
+n for failure:
### find out what it is with the '$!' (actual error) variable.
open FH3, "lessons.txt" or die "lessons.txt: $!\n";
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Update: Added a description of the errors in the script.


-- 
Human history becomes more and more a race between education and catastrophe. -- HG Wells

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Re^2: Splitting an array loaded from a file handle. by trenchwar (Beadle) on Apr 14, 2008 at 16:12 UTC
That makes much more sense, I cleaned it up and think I have a better grasp on what I was doing. One more small question, if I define the variable before reading it into an array can I print it out of the block? Thank you for what seems to be your infinite patients when passing along your knowledge. I appreciate it more than you will ever know. #!/usr/bin/perl use warnings; use strict; my @l; open (FH3, ">lessons.txt"); print FH3 "PerlLesson1\n"; print FH3 "PerlLesson2\n"; print FH3 "PerlLesson3\n"; print FH3 "JavaLesson1\n"; print FH3 "JavaLesson2\n"; print FH3 "JavaLesson3\n"; print FH3 "PHPLesson1\n"; print FH3 "PHPLesson2\n"; print FH3 "PHPLesson3\n"; close (FH3); my $l="lessons.txt"; open FH3, "<", $l or die "$l: $!\n"; @l=<FH3>; for my $line (@l){ chomp $line; my ($part1, $part2) = split /\/,$line; print "$part1 $part2\n"; } [download]	[reply] [d/l]

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Re^2: Splitting an array loaded from a file handle.
by trenchwar (Beadle) on Apr 14, 2008 at 16:12 UTC

#!/usr/bin/perl

use warnings;
use strict;

my @l;
open (FH3, ">lessons.txt");
        print FH3 "Perl*Lesson1\n";
        print FH3 "Perl*Lesson2\n";
        print FH3 "Perl*Lesson3\n";
        print FH3 "Java*Lesson1\n";
        print FH3 "Java*Lesson2\n";
        print FH3 "Java*Lesson3\n";
        print FH3 "PHP*Lesson1\n";
        print FH3 "PHP*Lesson2\n";
        print FH3 "PHP*Lesson3\n";
close (FH3);


my $l="lessons.txt";
open FH3, "<", $l or die "$l: $!\n";
@l=<FH3>;
for my $line (@l){
    chomp $line;
        my ($part1, $part2) = split /\*/,$line;
    print "$part1 $part2\n";
}
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