Perl one liners are small and awesome perl programs that fit in one line of code and do one thing really well. This article introduces some of the more common perl options found in command line programs, also. These things include changing line spacing, numbering lines, doing calculations, converting and substituting text, deleting and printing certain lines, parsing logs, editing files inplace, doing statistics, carrying out system administration tasks, updating a bunch of files at once, and many more. Perl oneliners are small and awesome perl programs that fit in one line of code and do one thing really well. Getting started with perl language, comments, variables, interpolation in perl, true and false, dates and time, control statements, subroutines, debug output, lists, sorting, file io reading and writing files, reading a files content into a variable and strings and quoting methods. Perl oneliners showcases short and compelling lines of code that do all sorts of handy, geeky.
Inside youll find well over 100 custom oneliners that can perform some pretty handy tasks. If youre looking for a free download links of perl oneliners. They do one thing really welllike changing line spacing, numbering lines, performing calculations, converting and substituting text, deleting and printing specific lines, parsing logs, editing files inplace, calculating statistics, carrying out system. Introduction to perl one liners i think perl one liners are still super useful.
Perlone liners are powertools that get a lot of work done with a single command. Perl oneliners showcases short and compelling lines of code that do all sorts of handy, geeky things. Its cleaner with fewer special variables and options to memorize. I got allowed from peteris krumins who have written a book about perl oneliners and i have read that book and 99% of the oneliners come from this book. If you get a secret thrill out of a well crafted perl oneliner, but only have a few that you can pull out of your mental pocket and use, this book.
Introduction to perl oneliners i think perl oneliners are still super useful. In perl one liners, author and impatient hacker peteris krumins takes you through more than 100 compelling one liners that do all sorts of handy things, such as manipulate line spacing, tally column values in a. Sign in sign up instantly share code, notes, and snippets. I went through all the one liners, improved explanations, fixed mistakes and typos, added a bunch of new one liners, added an introduction to perl one liners and a new chapter on perl s special variables. For advanced oneliners like this, you could also use the psh command from psh, a simple pure perl shell. Perl one liners are small and awesome perl programs that fit in a single line of code and they do one thing really well. This aspect of perls greatness is easily forgotten and left in the shadows. Next, it has a silly 00 commandline option that turns paragraph slurp mode on, meaning perl reads text paragraph by paragraph, rather than line by line. Ive now written the perl one liners explained e book based on this article series. Im happy to announce my 3rd e book called perl oneliners explained. You can use them on the unix commandlineor indeed on the command line of any os where perl is installed. Peteris krumins perl oneliners showcases short and compelling lines of code that do all sorts of handy, geeky things. Often, the perfect tool is the oneliner, a small but powerful program that fits in one line of code and does one.
This book requires some perl knowledge, but most of. Read perl one liners programs that get things done by peteris krumins available from rakuten kobo. Perl oneliners showcases short and compelling lines of code that do all sorts of handy, geeky things like numbering lines in a file. The top 10 tricks of perl oneliners oracle linux blog. This cookbook of useful, customizable, and fun scripts will even help hone your perl coding skills, as krumins dissects the code to give you a deeper understanding of the language. This ability to do so many tasks is the reason why perl is nicknamed the swissarmy chain saw of unix tools. This book requires some perl knowledge, but most of the oneliners can be tweaked and. Introduction to perl oneliners pdf peteris krumins. In perl oneliners, author and impatient hacker peteris krumins takes you through more than 100 compelling oneliners that do all sorts of handy things, such as manipulate line spacing, tally column values in a. People still learn perl because its practical and valuable in certain contexts. From the book, the lighthouse by virginia woolf friendships, even the best of them, are frail things.
Everyday low prices and free delivery on eligible orders. And just like perl 6 cleaned up perl 5s warts elsewhere, the one liner syntax is also better. Download it once and read it on your kindle device, pc, phones or tablets. Perl one liners showcases short and compelling lines of code that do all sorts of handy, geeky things like numbering lines in a file. Those generous folks at no starch press are offering a 30% discount on the new perl book.
Perl oneliners remember when i said i was going to be on a plane for a combined total of 12 hours, and i was going to use it to work through a bunch. Whats the easiest way to install a missing perl module. Perl one liner recipes, not regex recipes other pages about perl regex one liners focus on showing you the regular expressions to accomplish. In perl one liners, author and impatient hacker peteris krumins takes you through more than 100 compelling one liners that do all. Ive now written the perl oneliners explained e book based on this article series. Often, the perfect tool is the one liner, a small but powerful program that fits in one line of code and does one thing really well. A great book for beginners and seasoned programmers alike. This book is based on the perl oneliners explained article series that i wrote over the last 3 years and that has been read over 1,000,000 times. The authors light and humorous style is a great introduction to the power and productivity of perl oneliners. This one is only interested in perl oneliners in the context of regular expression matching, replacing and splitting. This book provides many useful examples of perl 6 one liners that can do everything from finding duplicate lines in a file to running a web server. Calculations in this chapter, well look at various oneliners for performing calculations, such as finding minimum and maximum elements, counting, shuffling and permuting words, and calculating dates and selection from perl oneliners book. Read perl oneliners programs that get things done by peteris krumins available from rakuten kobo.
Of human bondage by somerset maugham the simplest pattern, that in which a man was born, worked, married, had children. Perl oneliner recipes, not regex recipes other pages about perl regex oneliners focus on showing you the regular expressions to accomplish. With its terse syntax and powerful mathematical operators, apl allowed useful programs to be represented in a few symbols. We talk about his favourite perl one liners, publishing books and perl on windows. Peteris krumins perl one liners showcases short and compelling lines of code that do all sorts of handy, geeky things.
Note if the content not found, you must refresh this page manually. In the 1970s, oneliners became associated with the rise of the home computer and basic. The concept of a one liner program has been known since the 1960s with the release of the apl programming language. All these oneliners are explained in greater detail in the book. Perl oneliners ebook by peteris krumins 9781593275693. To purchase books, visit amazon or your favorite retailer. Among other interesting one liners he provided a collection of useful one liners of using ranges in perl one lines as well as in place editing. Often, the perfect tool is the oneliner, a small but powerful program that fits in one line of code and does one thing really well. This one is only interested in perl one liners in the context of regular expression matching, replacing and splitting. In perl oneliners, author and impatient hacker peteris krumins takes you through more than 100 compelling oneliners that do all sorts of handy things, such as manipulate line spacing, tally column values in a table, and get a list of users on a system. Peteris krumins snappy perl programs to streamline tasks and sharpen coding skills perl oneliners are small and awesome perl programs that fit in one line of code and do one thing really well. Discover delightful childrens books with prime book box, a subscription that delivers new books every 1, 2, or 3 months new customers receive 15% off your. Oct 22, 20 often, the perfect tool is the one liner, a small but powerful program that fits in one line of code and does one thing really well.
Perl oneliners remember when i said i was going to be on a plane for a combined total of 12 hours, and i was going to use it to work through a bunch of books. This perl book contains more than 100 oneliners that do all sorts tasks. Generate a random eightletter password perl le print map azrand 26. Well start with a brief refresher on the basics of perl one liners before we begin.
What are the best one liners you have read from booksnovels. They are small perl programs that are run directly from command line. Nov 05, 2017 11 perl one liner script examples, a very interesting feature of the perl programming language is its ability to execute condensed one line versions of otherwise complete perl scripts including but not limited to modifying files, replacing text etc. In 2003 theodor zlatanov, who authored a series of interesting articles about perl on ibm developerworks site published an article cultured perl one liners 102. If youre looking for a free download links of perl one liners. Like this one from the kubernetes job documentation. In perl oneliners, author and impatient hacker peteris krumins takes you through more than 100 compelling oneliners that do all. With perl oneliners youll learn why this language is so valuable and how it can best be used to save time. Presents general recipes to build perl regular expression oneliners to match, replace and split, either linebyline or. Use features like bookmarks, note taking and highlighting while reading perl one liners. In the 1970s, one liners became associated with the rise of the home computer and basic. So the only fate one liners would normally aspire to would be to be relegated to a lonely corner of a book. Perl used to be far and away my language of choice, but these days im more likely to write new code in python, largely because far more of my friends and coworkers are comfortable with it.
Perl oneliners has been published by no starch press. Mar 20, 2017 cultured perl oneliners 102 mar 20, 2017. This oneliner and others in this book work well in unix. Perl oneliners by peteris krumins overdrive rakuten. Download python one liners pdf or read python one liners pdf online books in pdf, epub and mobi format. I went through all the oneliners in the article series, improved. The core of any perl one liner is the e switch, which lets you pass a snippet of code on the commandline. I went through all the oneliners, improved explanations, fixed mistakes and typos, added a bunch of new oneliners, added an introduction to perl oneliners and a new chapter on perls special variables. The second standard trick to perl one liners are the n and p flags. Part of the fun of programming in perl lies in tackling tedious tasks with short, efficient, and reusable code.
The site also has a page about perl regex, but this one is only about one liners. Advance praise for perl oneliners one of the slogans used by perl. Ive been a perl programmer for many years but often forget how powerful and useful oneliners can be. Click download or read online button to get python one liners pdf book now. In this introductory chapter, ill show you what oneliners look like and give you a taste of whats in the rest of the book. The concept of a oneliner program has been known since the 1960s with the release of the apl programming language.
486 1247 895 601 468 1390 337 356 627 521 1106 1070 359 112 936 1523 1401 1283 324 1146 159 296 1086 93 848 902 362 1152 293 592 798