perl 读写文件

大湖之子

　　#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