perl讀寫檔案代碼執行個體

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perl讀寫檔案代碼執行個體

   這篇文章主要介紹了perl讀寫檔案代碼執行個體,本文直接給出實現代碼,需要的朋友可以參考下

  #mode operand create truncate

  #read <

  #write > yes yes

  #append >> yes

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

   代碼如下:

  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:

  代碼如下:

  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

  代碼如下:

  use strict;

  use warnings;

  my $filename = 'data.txt';

  open (FILEIN, "<", $filename)

  or die "Could not open file '$filename' with the error $!";

  my @FileContents = ;

  for my $l (@FileContents){

  print "$l\n";

  }

  close FILEIN;

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