Run Ruby Script From Command Line With Arguments

Quit unless our script gets two command line arguments unless.

Run ruby script from command line with arguments.

Here sys argv 0 is the program ie. 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. Optionparser will automatically generate help screens for you from this description as well as infer everything about the argument from its description. Ruby script arguments are passed to the ruby program by the shell the program that accepts commands such as bash on the terminal.

To run the test rb ruby script run the command ruby test rb. Your ruby files will all have the rb file extension. The interpreter can be invoked with any of the following options to control the environment and behavior of the interpreter. Shell scripts also accept command line arguments similar to nix commands.

Open a command line window and navigate to your ruby scripts directory using the cd command. On the command line any text following the name of the script is considered a command line argument. The python sys module provides access to any command line arguments via the sys argv. Running this script we get.

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. When written inside your ruby program argv will take take a command line command that looks like this. Using command line arguments.

Ruby testing argv rb these are elements in the argv array. Ruby captures command line arguments with a special array named argv. Len sys argv is the number of command line arguments. The script should ask you for your.

And create an array that looks like this. Ruby is generally run from the command line in the following way ruby options programfile arguments. 1 getting the number of command line args. To get the number of command line arguments passed in to your ruby script check argv length like this.

This serves two purposes sys argv is the list of command line arguments. Once there you can list files using the dir command on windows or the ls command on linux or os x. To read command line args in a ruby script use the special ruby array argv to get the information you need.