perl 读写文件

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#http://perlmaven.com/open-and-read-from-files

#mode operand create truncate
#read <
#write > yes yes
#append >> yes

Case 1: Throw an exception if you cannot open the file:

use strict;
use warnings;

my $filename = 'data.txt';
open(my $fh, '<:encoding(UTF-8)', $filename)
or die "Could not open file '$filename' with the error $!";

while (my $row = <$fh>) {
chomp $row;
print "$row\n";
}
close($fh);

Case 2: Give a warning if you cannot open the file, but keep running:

use strict;
use warnings;

my $filename = 'data.txt';
if (open(my $fh, '<:encoding(UTF-8)', $filename)) {
while (my $row = <$fh>) {
chomp $row;
print "$row\n";
}
close($fh);
} else {
warn "Could not open file '$filename' $!";
}

Case 3: Read one file into array

use strict;
use warnings;

my $filename = 'data.txt';
open (FILEIN, "<", $filename) 
or die "Could not open file '$filename' with the error $!";
my @FileContents = <FILEIN>;
for my $l (@FileContents){
print "$l\n";
}
close FILEIN;

end