【Ruby】 dynamic, reflective, object-oriented, general-purpose programming language【ruby】

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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腾图小抄 SCWY.net v0.03 小抄561条 自2022-01-02访问318111次