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Perl One-Liners : 130 programs that get things done /

Part of the fun of programming in Perl lies in tackling tedious tasks with short, efficient, and reusable code. 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. In Perl One-Liners, author and impatient hacker Peteris...

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Detalles Bibliográficos
Clasificación:Libro Electrónico
Autor principal: Krumins, Peteris
Formato: Electrónico eBook
Idioma:Inglés
Publicado: San Francisco : No Starch Press, 2013.
Temas:
Acceso en línea:Texto completo
Texto completo

MARC

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520 |a Part of the fun of programming in Perl lies in tackling tedious tasks with short, efficient, and reusable code. 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. 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 table, and get a list of users on a system. 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. You'll find one-liners that: -Encode, decode, and convert strings -Generate random passwords -Calculate sums, factorials, and the mathematical constants pi and e -Add or remove spaces -Number lines in a file -Print lines that match a specific pattern -Check to see if a number is prime with a regular expression -Convert IP address to decimal form -Replace one string with another And many more! Save time and sharpen your coding skills as you learn to conquer those pesky tasks in a few precisely placed keystrokes with Perl One-Liners. 
505 0 |a Introduction to Perl One-Liners -- Spacing -- Numbering -- Calculations -- Working with Arrays and Strings -- Text Conversion and Substitution -- Selectively Printing and Deleting Lines -- Useful Regular Expressions -- perl1line.txt -- A. Perl's Special Variables -- B. Using Perl One-Liners on Windows. 
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880 8 |6 505-00/(S  |a 4.7 Find the numerically largest element (maximum element) on each line -- 4.8 Find the numerically largest element (maximum element) over all lines -- 4.9 Replace each field with its absolute value -- 4.10 Print the total number of fields on eachline -- 4.11 Print the total number of fields on each line, followed by the line -- 4.12 Print the total number of fields on all lines -- 4.13 Print the total number of fields that match a pattern -- 4.14 Print the total number of lines that match a pattern -- 4.15 Print the number π -- 4.16 Print the number e -- 4.17 Print UNIX time (seconds since January 1, 1970, 00:00:00 UTC) -- 4.18 Print Greenwich Mean Time and local computer time -- 4.19 Print yesterday's date -- 4.20 Print the date 14 months, 9 days, and 7 seconds ago -- 4.21 Calculate the factorial -- 4.22 Calculate the greatest common divisor -- 4.23 Calculate the least common multiple -- 4.24 Generate 10 random numbers between 5 and 15 (excluding 15) -- 4.25 Generate all permutations of a list -- 4.26 Generate the powerset -- 4.27 Convert an IP address to an unsigned integer -- 4.28 Convert an unsigned integer to an IP address -- 5: Working with Arrays and Strings -- 5.1 Generate and print the alphabet -- 5.2 Generate and print all the strings from "a" to "zz" -- 5.3 Create a hex lookup table -- 5.4 Generate a random eight-character password -- 5.5 Create a string of specific length -- 5.6 Create an array from a string -- 5.7 Create a string from the command-line arguments -- 5.8 Find the numeric values for characters in a string -- 5.9 Convert a list of numeric ASCII values into a string -- 5.10 Generate an array with odd numbers from 1 to 100 -- 5.11 Generate an array with even numbers from 1 to 100 -- 5.12 Find the length of a string -- 5.13 Find the number of elements in an array -- 6: Text Conversion and Substitution -- 6.1 ROT13 a string. 
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