Muutke küpsiste eelistusi

E-raamat: Perl One-Liners

3.92/5 (63 hinnangut Goodreads-ist)
  • Formaat: EPUB+DRM
  • Ilmumisaeg: 26-Nov-2013
  • Kirjastus: No Starch Press,US
  • Keel: eng
  • ISBN-13: 9781593275693
Teised raamatud teemal:
  • Formaat - EPUB+DRM
  • Hind: 25,03 €*
  • * hind on lõplik, st. muud allahindlused enam ei rakendu
  • Lisa ostukorvi
  • Lisa soovinimekirja
  • See e-raamat on mõeldud ainult isiklikuks kasutamiseks. E-raamatuid ei saa tagastada.
Perl One-LinersSuurem pilt
  • Formaat: EPUB+DRM
  • Ilmumisaeg: 26-Nov-2013
  • Kirjastus: No Starch Press,US
  • Keel: eng
  • ISBN-13: 9781593275693
Teised raamatud teemal:

DRM piirangud

  • Kopeerimine (copy/paste):

    ei ole lubatud

  • Printimine:

    ei ole lubatud

  • Kasutamine:

    Digitaalõiguste kaitse (DRM)
    Kirjastus on väljastanud selle e-raamatu krüpteeritud kujul, mis tähendab, et selle lugemiseks peate installeerima spetsiaalse tarkvara. Samuti peate looma endale  Adobe ID Rohkem infot siin. E-raamatut saab lugeda 1 kasutaja ning alla laadida kuni 6'de seadmesse (kõik autoriseeritud sama Adobe ID-ga).

    Vajalik tarkvara
    Mobiilsetes seadmetes (telefon või tahvelarvuti) lugemiseks peate installeerima selle tasuta rakenduse: PocketBook Reader (iOS / Android)

    PC või Mac seadmes lugemiseks peate installima Adobe Digital Editionsi (Seeon tasuta rakendus spetsiaalselt e-raamatute lugemiseks. Seda ei tohi segamini ajada Adober Reader'iga, mis tõenäoliselt on juba teie arvutisse installeeritud )

    Seda e-raamatut ei saa lugeda Amazon Kindle's. 

"Perl one-liners are small and awesome Perl programs that fit in one line of code and do one thing really well. Perl One-Liners showcases 130 short and compelling lines of code that do all sorts of handy, geeky things like numbering lines in a file; generating random passwords; encoding, decoding, and converting strings; calculating factorials; even checking to see if a number is prime with a regular expression. Author Peteris Krumins' dissections of each bit of code will help you gain a deeper understanding of the Perl language, and these Perl one-liners are sure to save you time and sharpen your sleight of hand"--

"Snappy Perl programs to streamline tasks and sharpen coding skills"--



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 p 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 you coding skills as you learn to conquer those pesky tasks in a few precisely placed keystrokes with Perl One-Liners.
Acknowledgments xvii
1 Introduction To Perl One-Liners 1(6)
2 Spacing 7(10)
2.1 Double-space a file
7(4)
2.2 Double-space a file, excluding the blank lines
11(1)
2.3 Triple-space a file
11(1)
2.4 N-space a file
12(1)
2.5 Add a blank line before every line
12(1)
2.6 Remove all blank lines
12(2)
2.7 Remove all consecutive blank lines, leaving only one
14(1)
2.8 Compress/expand all blank lines into N consecutive lines
14(1)
2.9 Double-space between all words
15(1)
2.10 Remove all spacing between words
15(1)
2.11 Change all spacing between words to one space
16(1)
2.12 Insert a space between all characters
16(1)
3 Numbering 17(12)
3.1 Number all lines in a file
17(1)
3.2 Number only non-empty lines in a file
18(1)
3.3 Number and print only non-empty lines in a file (drop empty lines)
19(1)
3.4 Number all lines but print line numbers only for non-empty lines
20(1)
3.5 Number only lines that match a pattern; print others unmodified
20(1)
3.6 Number and print only lines that match a pattern
21(1)
3.7 Number all lines but print line numbers only for lines that match a pattern
21(1)
3.8 Number all lines in a file using a custom format
22(1)
3.9 Print the total number of lines in a file (emulate we -l)
22(2)
3.10 Print the number of non-empty lines in a file
24(1)
3.11 Print the number of empty lines in a file
25(1)
3.12 Print the number of lines in a file that match a pattern (emulate grep -c)
25(1)
3.13 Number words across all lines
26(1)
3.14 Number words on each individual line
26(1)
3.15 Replace all words with their numeric positions
27(2)
4 Calculations 29(20)
4.1 Check if a number is a prime
29(1)
4.2 Print the sum of all fields on each line
30(1)
4.3 Print the sum of all fields on all lines
31(1)
4.4 Shuffle all fields on each line
32(1)
4.5 Find the numerically smallest element (minimum element) on each line
33(1)
4.6 Find the numerically smallest element (minimum element) over all lines
33(2)
4.7 Find the numerically largest element (maximum element) on each line
35(1)
4.8 Find the numerically largest element (maximum element) over all lines
35(1)
4.9 Replace each field with its absolute value
36(1)
4.10 Print the total number of fields on each line
36(1)
4.11 Print the total number of fields on each line, followed by the line
37(1)
4.12 Print the total number of fields on all lines
37(1)
4.13 Print the total number of fields that match a pattern
38(1)
4.14 Print the total number of lines that match a pattern
38(1)
4.15 Print the number π
39(1)
4.16 Print the number e
39(1)
4.17 Print UNIX time (seconds since January 1, 1970, 00:00:00 UTC)
39(1)
4.18 Print Greenwich Mean Time and local computer time
40(1)
4.19 Print yesterday's date
41(1)
4.20 Print the date 14 months, 9 days, and 7 seconds ago
41(1)
4.21 Calculate the factorial
41(1)
4.22 Calculate the greatest common divisor
42(1)
4.23 Calculate the least common multiple
43(1)
4.24 Generate 10 random numbers between 5 and 15 (excluding 15)
43(1)
4.25 Generate all permutations of a list
44(1)
4.26 Generate the powerset
45(1)
4.27 Convert an IP address to an unsigned integer
45(2)
4.28 Convert an unsigned integer to an IP address
47(2)
5 Working With Arrays And Strings 49(10)
5.1 Generate and print the alphabet
49(1)
5.2 Generate and print all the strings from "a" to "zz"
50(1)
5.3 Create a hex lookup table
51(1)
5.4 Generate a random eight-character password
51(1)
5.5 Create a string of specific length
52(1)
5.6 Create an array from a string
52(1)
5.7 Create a string from the command-line arguments
53(1)
5.8 Find the numeric values for characters in a string
53(2)
5.9 Convert a list of numeric ASCII values into a string
55(1)
5.10 Generate an array with odd numbers from 1 to 100
55(1)
5.11 Generate an array with even numbers from 1 to 100
56(1)
5.12 Find the length of a string
56(1)
5.13 Find the number of elements in an array
56(3)
6 Text Conversion And Substitution 59(10)
6.1 ROT13 a string
59(1)
6.2 Base64-encode a string
60(1)
6.3 Base64-decode a string
61(1)
6.4 URL-escape a string
61(1)
6.5 URL-unescape a string
61(1)
6.6 HTML-encode a string
62(1)
6.7 HTML-decode a string
62(1)
6.8 Convert all text to uppercase
62(1)
6.9 Convert all text to lowercase
62(1)
6.10 Uppercase only the first letter of each line
63(1)
6.11 Invert the letter case
63(1)
6.12 Title-case each line
63(1)
6.13 Strip leading whitespace (spaces, tabs) from the beginning of each line
64(1)
6.14 Strip trailing whitespace (spaces, tabs) from the end of each line
64(1)
6.15 Strip whitespace (spaces, tabs) from the beginning and end of each line
64(1)
6.16 Convert UNIX newlines to DOS/Windows newlines
65(1)
6.17 Convert DOS/Windows newlines to UNIX newlines
65(1)
6.18 Convert UNIX newlines to Mac newlines
65(1)
6.19 Substitute (find and replace) "foo" with "bar" on each line
66(1)
6.20 Substitute (find and replace) "foo" with "bar" on lines that match "baz"
66(1)
6.21 Print paragraphs in reverse order
66(1)
6.22 Print all lines in reverse order
67(1)
6.23 Print columns in reverse order
67(2)
7 Selectively Printing And Deleting Lines 69(14)
7.1 Print the first line of a file (emulate head -1)
70(1)
7.2 Print the first 10 lines of a file (emulate head -10)
70(1)
7.3 Print the last line of a file (emulate tail -1)
71(1)
7.4 Print the last 10 lines of a file (emulate tail -10)
72(1)
7.5 Print only lines that match a regular expression
72(1)
7.6 Print only lines that do not match a regular expression
73(1)
7.7 Print every line preceding a line that matches a regular expression
73(1)
7.8 Print every line following a line that matches a regular expression
74(1)
7.9 Print lines that match regular expressions AAA and BBB in any order
75(1)
7.10 Print lines that don't match regular expressions AAA and BBB
75(1)
7.11 Print lines that match regular expression AAA followed by BBB followed by CCC
75(1)
7.12 Print lines that are at least 80 characters long
76(1)
7.13 Print lines that are fewer than 80 characters long
76(1)
7.14 Print only line 13
76(1)
7.15 Print all lines except line 27
76(1)
7.16 Print only lines 13, 19, and 67
77(1)
7.17 Print all lines from 17 to 30
77(1)
7.18 Print all lines between two regular expressions (including the lines that match)
78(1)
7.19 Print the longest line
78(1)
7.20 Print the shortest line
79(1)
7.21 Print all lines containing digits
79(1)
7.22 Print all lines containing only digits
79(1)
7.23 Print all lines containing only alphabetic characters
80(1)
7.24 Print every second line
80(1)
7.25 Print every second line, beginning with the second line
80(1)
7.26 Print all repeated lines only once
81(1)
7.27 Print all unique lines
81(2)
8 Useful Regular Expressions 83(12)
8.1 Match something that looks like an IP address
83(1)
8.2 Test whether a number is in the range 0 to 255
84(1)
8.3 Match an IP address
85(1)
8.4 Check whether a string looks like an email address
86(1)
8.5 Check whether a string is a number
87(1)
8.6 Check whether a word appears in a string twice
88(1)
8.7 Increase all integers in a string by one
89(1)
8.8 Extract the HTTP User-Agent string from HTTP headers
89(1)
8.9 Match printable ASCII characters
90(1)
8.10 Extract text between two HTML tags
90(1)
8.11 Replace all <b> tags with <strong>
91(1)
8.12 Extract all matches from a regular expression
92(3)
A PERL'S Special Variables 95(10)
A.1 Variable $_
95(4)
Using $_ with the -n argument
96(1)
Using $_ with the -p argument
97(1)
Using $_ explicitly
98(1)
A.2 Variable $.
99(1)
A.3 Variable $/
100(1)
A.4 Variable $\
101(1)
A.5 Variables $1, $2, $3, and so on
101(1)
A.6 Variable $,
102(1)
A.7 Variable $"
102(1)
A.8 Variable @F
103(1)
A.9 Variable @ARGV
103(1)
A.10 Variable %ENV
104(1)
B Using PERL One-Liners On Windows 105(12)
B.1 Perl on Windows
105(1)
B.2 Bash on Windows
106(1)
B.3 Perl One-Liners in Windows Bash
107(1)
B.4 Perl One-Liners in the Windows Command Prompt
108(3)
Converting One-Liners in the Windows Command Prompt
108(2)
Symbol Challenges
110(1)
Windows File Paths
111(1)
B.5 Perl One-Liners in PowerShell
111(6)
Converting One-Liners in PowerShell
112(2)
One-Liners in PowerShell 3.0+
114(3)
C PER1LINE.TXT 117(22)
C.1 Spacing
117(2)
C.2 Numbering
119(2)
C.3 Calculations
121(6)
C.4 Working with Arrays and Strings
127(3)
C.5 Text Conversion and Substitution
130(3)
C.6 Selectively Printing and Deleting Lines
133(3)
C.7 Useful Regular Expressions
136(3)
Index 139
Lisainfo e-raamatute kohta Lisainfo e-raamatute kohta
Püsilink: https://www.kriso.ee/db/97815932756936e.html
Märksõnad: