How do you perform file handling and I/O operations in Perl?

In Perl, file handling and I/O operations are essential for reading from and writing to files, interacting with external resources, and processing data. Let's explore the various techniques and functions available in Perl for file handling and I/O operations: 1. Opening and Closing Files: * The `open()` function is used to open a file for reading or writing. It takes two arguments: the filehandle and the file name or file descriptor. * Example: ``` perl`open(my $fh, '<', 'filename.txt') or die "Cannot open file: $!";` ``` * The filehandle, represented by `$fh` in the example, is used to refer to the opened file for subsequent operations. 2. Reading from Files: * The `readline()` function, also known as the diamond operator (`<>`), is used to read a line from a file. * Example: ``` perl`while (my $line = <$fh>) { # Process each line }` ``` * The ....