perl function link

The link function in Perl is used to create a hard link between two files. It takes two arguments: the name of the source file (which will be the original file), and the name of the target file (which will be the new hard link).

Here's an example that demonstrates how to use link:

#!/usr/bin/perl

use strict;
use warnings;

# Create a source file
my $source_file = "test.txt";
open(my $fh, ">", $source_file) or die "Cannot create $source_file: $!\n";
print $fh "This is a test\n";
close($fh);

# Create a hard link to the source file
my $link_file = "test_link.txt";
link($source_file, $link_file) or die "Cannot create hard link: $!\n";

# Read the contents of the new file
open($fh, "<", $link_file) or die "Cannot read $link_file: $!\n";
my $contents = <$fh>;
close($fh);

# Print the contents of the new file
print "Contents of $link_file:\n";
print "$contents";

In this example, we start by creating a new file called "test.txt" and writing some content to it. We then use the link function to create a hard link to this file, using the name "test_link.txt" for the new link. Finally, we read the contents of the new file and print them to the console.

When we run this script, we see that the contents of the new file are identical to the contents of the original file:

Contents of test_link.txt:
This is a test