🖥️ruby

➡️This is a command-line reference manual for commands and command combinations that you don’t use often enough to remember it. This cheatsheet explains the ruby command with important options and switches using examples.

▁ ▂ ▃ ▄ ꧁ 🔴☠ COMMANDLINE-KUNGFU WITH CHEATSHEETS ☠🔴꧂▅ ▃ ▂ ▁

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# Ruby is a dynamic, reflective, object-oriented, general-purpose programming language
# ruby is a ruby interpreter

# invoke Ruby from the command line to run the script foo.rb
ruby foo.rb

# pass code as an argument
ruby -e 'puts "Hello world"'

# The -n switch acts as though the code you pass to Ruby was wrapped in the following:
# while gets
#  # code here
#  end
ruby -ne 'puts $_' file.txt

# The -p switch acts similarly to -n, in that it loops over each of the lines in the input
# after your code has finished, it always prints the value of $_
# Example: replace e with a
echo "eats, shoots, and leaves" | ruby -pe '$_.gsub!("e", "a")'

# BEGIN block executed before the loop
echo "foo\nbar\nbaz" | ruby -ne 'BEGIN { i = 1 }; puts "#{i} #{$_}"; i += 1'
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  █║▌│║█║▌★ KALI ★ PARROT ★ DEBIAN 🔴 PENTESTING ★ HACKING ★ █║▌│║█║▌

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               █║▌│║█║▌ WITH COMMANDLINE-KUNGFU POWER █║▌│║█║▌

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