perl function tell

In Perl, the tell function is used to get the current position of the filehandle. It returns the current position in bytes from the start of the file.

Here's an example:

# Open a file for reading
open(my $fh, '<', 'example.txt') or die "Could not open file: $!";

# Read the first 10 bytes from the file
my $buffer;
read($fh, $buffer, 10);

# Get the current position of the filehandle
my $pos = tell($fh);
print "Current position: $pos\n";

# Close the filehandle
close($fh);

In this example, we open a file named example.txt for reading and then read the first 10 bytes from the file. We then use the tell function to get the current position of the filehandle and print it to the screen. Finally, we close the filehandle.

Note that the tell function can only be used with filehandles that have been opened in binary mode (:raw) or in a mode that supports random access (such as :seekable). If the filehandle does not support seeking, the tell function will return an undefined value.