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Ruby
The 14 most important Ruby Resources
Run only one instance of a Ruby program at the same time - self locking
Open file and read content in Ruby
Convert String to Number in Ruby
Arrays in Ruby
Variables and Variable Interpolation in Ruby
Basic data structures in Ruby (Scalar, Array, Hash)
How to convert a string to UPPERCASE or lowercase in Ruby?
Solution: Number guessing game in Ruby
Analyze Apache log file - count localhost in Ruby
Count web server hits using Ruby
Solution: rectangle in Ruby (CLI and STDIN = Standard IO)
Solution: Sum of numbers in a file implemented in Ruby
Download an HTML page using Ruby
How to write to file in Ruby
Count digits in Ruby
Iterate over characters of a string in Ruby
split in Ruby
ARGV - the command line arguments of a Ruby program