Run Ruby Script From Command Line With Arguments

Your ruby files will all have the rb file extension.

Run ruby script from command line with arguments.

Here sys argv 0 is the program ie. Ruby captures command line arguments with a special array named argv. The interpreter can be invoked with any of the following options to control the environment and behavior of the interpreter. In this snippet of code we first check if we got exactly 2 parameters and we do we add them together.

Here are a few examples. Consider the following script test py. To get the number of command line arguments passed in to your ruby script check argv length like this. Ruby is generally run from the command line in the following way ruby options programfile arguments.

A command line arguments are passed after the name of a program in command line operating systems like dos or linux and are passed into the program from the operating system. To run the test rb ruby script run the command ruby test rb. Quit unless our script gets two command line arguments unless. When written inside your ruby program argv will take take a command line command that looks like this.

Ruby testing argv rb these are elements in the argv array. This serves two purposes sys argv is the list of command line arguments. The script should ask you for your. Optionparser will automatically generate help screens for you from this description as well as infer everything about the argument from its description.

Using command line arguments. Running this script we get. And create an array that looks like this. Once there you can list files using the dir command on windows or the ls command on linux or os x.

You only have to write the command line switch its arguments the code to run when it s encountered and the command line switch description once in your script. Ruby command line argv check length rb one too few arguments ruby command line argv check length rb one two working on one two values received on the command line are strings. To read command line args in a ruby script use the special ruby array argv to get the information you need. Len sys argv is the number of command line arguments.

On the command line any text following the name of the script is considered a command line argument. Open a command line window and navigate to your ruby scripts directory using the cd command. 1 getting the number of command line args.