Perl One-Liners
When you write a Perl script, much of the time you'll write it as you have throughout this book—putting the script into a file, and then using the Perl interpreter to run that script. But sometimes there might be a task that's just really simple, or there might be something that you only need to do once (or very infrequently). For these kinds of tasks, it's almost a waste of time to start up an editor to write an actual script. For just this reason there are Perl one-liners.
Perl one-liners are scripts that you type directly on the Perl command line. They aren't saved anywhere; if you get them wrong you'll have to type them again.
To create a Perl one-liner, use the -e option, followed by the script inside quotes, like this:
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