Run Ruby Script From Command Line With Arguments

Shell scripts also accept command line arguments similar to nix commands.

Run ruby script from command line with arguments.

Ruby script arguments are passed to the ruby program by the shell the program that accepts commands such as bash on the terminal. Your ruby files will all have the rb file extension. To get the number of command line arguments passed in to your ruby script check argv length like this. In this snippet of code we first check if we got exactly 2 parameters and we do we add them together.

When written inside your ruby program argv will take take a command line command that looks like this. The interpreter can be invoked with any of the following options to control the environment and behavior of the interpreter. 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. The script should ask you for your.

To read command line args in a ruby script use the special ruby array argv to get the information you need. 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. The python sys module provides access to any command line arguments via the sys argv. 1 getting the number of command line args.

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. Len sys argv is the number of command line arguments. Ruby is generally run from the command line in the following way ruby options programfile arguments. Using command line arguments.

Running this script we get. On the command line any text following the name of the script is considered a command line argument. Here are a few examples. 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. Ruby captures command line arguments with a special array named argv. Here sys argv 0 is the program ie. Optionparser will automatically generate help screens for you from this description as well as infer everything about the argument from its description.

Ruby testing argv rb these are elements in the argv array. To run the test rb ruby script run the command ruby test rb. Consider the following script test py.