Linux command for a ruby script

Question

Hi ,

how could I run a ruby script as a command in linux.

I have this script which access the lib but i have to run it as

teraData.rb

i want to run it as teradata (or some meaningful command ) with args on linux from any command promt.

Where should i place the script and what should I do?

I am kinda new to linux so please help

Answer 1

As you're new to linux, I recommend:

$ cd /path/to/file
$ ruby ./teraData.rb

Once you gain confidence, it's also possible to just enter the filename in the shell prompt. To do this, you need to:

1. change the first line of teraData.rb to #! /usr/bin/env ruby (this will find the correct executable for you, other first lines are possible)
2. change the permissions of the file, to allow it to execute: chmod +x teraData.rb

Answer 2

write a shell script that invokes the ruby script. Make sure both are executable.

Answer 3

If the script is executable and the first line of the script is #!/usr/bin/ruby (or whatever the path to your ruby interpreter might be), then you should be able to launch the script directly (i.e. $ ./myscript.rb).

Otherwise, execute the interpreter and pass it the script as an argument (ruby ./myscript.rb).

If you want to run the script from anywhere using a simple command, wrap one of these methods in a bash function like so:

function teraData {
    ruby /path/to/script/teraData.rb $*
}

Place this function definition in your .bashrc file to have it automatically loaded whenever you open a shell.

Answer 4

put this as the first line of the script:

#!/usr/bin/env ruby