Perl by Example

Chapter 10. Getting a Handle on Files

Now it is time to see how Perl interacts with files, pipes, and command-line arguments. By the time you have finished this chapter, you should be able to explain the following script.

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use feature 'say';die "Insufficient arguments" if scalar @ARGV < 1;while(<>){   say "$ARGV $. $_ ";   say "x" x 30 && close ARGV if eof;}

10.1 The User-Defined Filehandle

If you are processing text, you will regularly be opening, closing, reading from, and writing to files. In Perl, we use filehandles to get access to system files.

A filehandle is a name for a file, device, pipe, or socket. In ...