按行读,存入标量 while (<FILE>) { print; } 按行读,存入数组 @array = <FILE>; 读入整个文件 ,存入标量 $string = do { local $/; <FILE>; }; 2)读文件实例 open (EP,"/etc/passwd"); while (<EP>) { chomp; print "I saw $_ in the password file!\n"; } 3)读写文件实例 open(...
We read the contents into a variable withslurp. Perl read text file into array In the next example, we read the text file into an array. main.pl #!/usr/bin/perl use v5.34.0; use warnings; use Path::Tiny; my $f = path('./words.txt'); my @lines = $f->lines; print $_ fo...
按行读,存入标量 while (<FILE>) { print; } 按行读,存入数组 @array = <FILE>; 读入整个文件 ,存入标量 $string = do { local $/; <FILE>; }; 2)读文件实例 open (EP,"/etc/passwd"); while (<EP>) { chomp; print "I saw $_ in the password file!\n"; } 3)读写文件实例 open(...
warn"Could not open file '$filename' $!"; } Case 3: Read one file into array usestrict; usewarnings; my$filename='data.txt'; open(FILEIN,"<",$filename) ordie"Could not open file '$filename' with the error $!"; my@FileContents= <FILEIN>; formy$l(@FileContents){ print"$l...
scalar变量将以美元符号($)开头,它可以存储数字,字符串或引用。 array变量将以符号@开头,它将存储有序的标量列表。 最后, Hash变量将以符号%开头,并将用于存储键/值对的集合。 Perl将每个变量类型保存在单独的命名空间中。 因此,您可以在不担心冲突的情况下,为标量变量,数组或散列使用相同的名称。 这意味着$ ...
numbersshift(@ARGV);my@line_numbers=sort{a<=>b}@ARGV;# Read whole file content into an array# and removes new line using chomp()chomp(my@file=<FNAME>);foreachmyvar(@line_numbers){if(var>#file){print"Line number var is too large\n";next;}print"file[$var-1]\n";}close FNAME;...
ARRAY HASH CODE REF GLOB LVALUE If the referenced object has been blessed into a package, then that package name is returned instead. You can think of "ref" as a "typeof" operator. if (ref($r) eq "HASH") { print "r is a reference to a hash./n"; ...
Variables can be interpolated into strings: print"Hello $string";# "Hello world"print"@array";# "print these strings out for me" 1. 2. Caution.One day you will put somebody's email address inside a string,"jeff@". This will cause Perl to look for an array variable called@gmailto in...
print "Array $vars1[0]\n"; Output: In the final example, we used the basic pack() and unpack() functions in the ip numbers. Basically, with the help of ‘.” Operator or symbol, we can split the numbers and set it as the system’s ip address. ...
If the first element of the variable name already references a hash array, the variable update will affect the original variable. [% foo = { bar = 'Baz' } %] [% INCLUDE somefile foo.bar='Boz' %] [% foo.bar %] # Boz This behavior can be a little unpredictable (and may well ...