User Guide #02 - Ruby - Getting Started

Ruby, ruby lesson, ruby уроки, user guide, руководство пользователя

First, you'll want to check whether ruby is installed. From the shell prompt (denoted here by " % ", so don't type the % ), type

% ruby -v

( -v tells the interpreter to print the version of ruby), then press the Enter key. If ruby is installed, you will see a message something like the following:

% ruby -v
ruby 1.6.6 (2001-12-26) [i586-linux]

If ruby is not installed, you need to install it, since ruby is free software with no restrictions on its installation or use.

Now, let's play with ruby. You can place a ruby program directly on the command line using the -e option:

% ruby -e 'print "hello world\n"'
hello world

More conventionally, a ruby program can be stored in a file.

% cat > test.rb
print "hello world\n"
^D
% cat test.rb
print "hello world\n"
% ruby test.rb
hello world

^D is control-D . The above is just for UNIX. If you're using DOS, try this:

C:\ruby> copy con: test.rb
print "hello world\n"
^Z
C:\ruby> type test.rb
print "hello world\n"
C:\ruby> ruby test.rb
hello world

When writing more substantial code than this, you will want to use a real text editor!

Some surprisingly complex and useful things can be done with miniature programs that fit in a command line. For example, this one replaces foo with bar in all C source and header files in the current working directory, backing up the original files with ".bak" appended:

% ruby -i.bak -pe 'sub "foo", "bar"' *.[ch]

This program works like the UNIX cat command (but works slower than cat ):

% ruby -pe 0 file
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April 6, 2020, 5:24 a.m.
Alexey

C++ - Test 001. The first program and data types

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April 5, 2020, 2:32 p.m.
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C++ - Test 002. Constants

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April 5, 2020, 2:31 p.m.
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C++ - Test 001. The first program and data types

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Last comments
April 3, 2020, 8:06 a.m.
Konstantin Grudnitskiy

Я надеюсь вы уже разобрались в чем дело, но если вдруг нет, то проблема состоит в том, что вы пытаетесь запустить программу из интерпретатора питона. Файл main.py это уже готова…
April 3, 2020, 6:18 a.m.
Konstantin Grudnitskiy

>>> text = 'hello world'>>> ' '.join(word for word in text.split()[:-1])'hello'>>> def remove_last_word(text):... return text and ' '.join(word for word in text.s…
March 27, 2020, 2:40 p.m.
Evgenij Legotskoj

Добрый день. В конце пятой статьи скачать можете.
March 27, 2020, 2:28 p.m.
mkdir _

Здравствуйте, а можно, пожалуйста, ссылку на целые исходники, если есть?
March 27, 2020, 4:36 a.m.
Evgenij Legotskoj

Скорее всего также, как и для установки всех остальных переменых в CMake, через использование set
Now discuss on the forum
s
April 6, 2020, 8:06 a.m.
shuric

Добрый день. Объясните пожалуйста ... ... допиливать стилевое оформление в прокси классе ... где именно копать ? В каком виртуальном методе лучше допиливать (если можно н…
April 6, 2020, 4:19 a.m.
Evgenij Legotskoj

Попробуй не переустанавливать материал, а просто менять цвет
April 5, 2020, 11:38 a.m.
Mihailll

Так работает windeployqt --qmldir E:\QTProject\testQmlAndCpp E:\test\build-testQmlAndCpp-Desktop_Qt_5_14_1_MinGW_32_bit-Release
April 5, 2020, 2:35 a.m.
Mihailll

Так работает console.log(textEmail.text) var str = textEmail.text; var n = str.search(/^((([0-9A-Za-z]{1}[-0-9A-z\.]{1,}[0-9A-Za-z]{1})|([0-9А-Яа-я]{1}[-0-9А-я\.]{1,}[…
April 3, 2020, 8:48 a.m.
Intruder

Евгений, добрый день. Спасибо!
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