刪除尾隨換行符

函式 chomp 將從傳遞給它的每個標量中刪除一個換行符（如果存在）。chomp 將改變原始字串並返回刪除的字元數

my $str = "Hello World\n\n";
my $removed = chomp($str);
print $str;     # "Hello World\n"
print $removed; # 1    

# chomp again, removing another newline
$removed = chomp $str;
print $str;     # "Hello World"
print $removed; # 1    

# chomp again, but no newline to remove
$removed = chomp $str;
print $str;     # "Hello World"
print $removed; # 0    

你還可以同時傳送多個字串：

my @strs = ("Hello\n", "World!\n\n"); # one newline in first string, two in second

my $removed = chomp(@strs); # @strs is now  ("Hello", "World!\n")
print $removed;             # 2

$removed = chomp(@strs); # @strs is now ("Hello", "World!")
print $removed;          # 1  

$removed = chomp(@strs); # @strs is still ("Hello", "World!")
print $removed;          # 0

但通常情況下，沒有人擔心刪除了多少換行符，因此通常在 void 上下文中看到 chomp，通常是由於從檔案中讀取了行：

while (my $line = readline $fh)
{
    chomp $line;

    # now do something with $line
}

my @lines = readline $fh2;

chomp (@lines); # remove newline from end of each line