Perl可以讓變量來操作文件，我們可以從文件中讀取或寫入數據，下面就讓武林技術頻道小編和大家說說perl讀寫文件代碼實例，一起跟著小編的思路來學習吧！
#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;
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