Ruby
Ruby standard library to help creating command line apps with arguments parsing
require 'optparse'options = {}OptionParser.new do |opts|opts.banner = "Usage: example.rb [options]"opts.on("-v", "--[no-]verbose", "Run verbosely") do |v|options[:verbose] = vendend.parse!p optionsp ARGV
Useful for reading & parsing binary or hexadecimal data.
Decodes string and returns array, according to template string given.
"ABC".unpack("H*") # Hex=> ["414243"]"ABC".unpack("H2")=> ["41"]"ABC".unpack("H2H2H2")=> ["41", "42", "43"]"ABC".unpack("U*") # Unicode=> [65, 66, 67]
Packs the contents of arr into a binary sequence, can reverse the unpack method.
["a", "b", "c"].pack("A")=> "a"["a", "b", "c"].pack("A3")=> "a "["a", "b", "c"].pack("A3A4A5")=> "a b c "[65, 66, 67].pack("U*")=> "ABC"["414243"].pack("H*")=> "ABC"["41", "42", "43"].pack("H2" * 3)=> "ABC"["ABCDE"].pack("m") # Base64 encode=> "QUJDREU=\n"
There are many directives to use building template strings. See Ruby docs for detail.
Ruby one-liners - Useful Ruby for command line usage
Last updated 2 months ago