首页 > 编程 > Perl > 正文

perl读写文件代码实例

2020-10-31 14:51:38
字体:
来源:转载
供稿:网友

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

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

复制代码 代码如下:

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:

复制代码 代码如下:

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

复制代码 代码如下:

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

发表评论 共有条评论
用户名: 密码:
验证码: 匿名发表