Trouble passing command line arguments to Ruby script and reading from command line

Question

I've narrowed the problem down to the following simple code snippet:

#!/usr/bin/env ruby

print "Enter your name: "
name = gets.chomp
puts "Hello #{name}"

This works fine when called from the OS X Terminal like this ruby a.rb. However passing a command line argument like this ruby a.rb 123 causes this error:

a.rb:4:in `gets': No such file or directory - 123 (Errno::ENOENT)
    from a.rb:4

My goal is to pass command line arguments to a script and read input from the keyboard.

What is causing the above error?

possible duplicate of How can same program in ruby accept input from user as well as command line arguments — Alex Wayne
– Alex Wayne, Commented Dec 29, 2011 at 22:49
You should probably look into using OptionParser. It will handle the clean-up for you and gives you a lot of command-line processing without a lot of hassle. — the Tin Man
– the Tin Man, Commented Dec 29, 2011 at 22:51

Community · Accepted Answer · 2017-05-23 10:27:06Z

2

Found the answer here: How can same program in ruby accept input from user as well as command line arguments

Just had to do ARGV.clear before using gets.

edited May 23, 2017 at 10:27

CommunityBot

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answered Dec 29, 2011 at 22:38

MrDatabase

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1 Comment

alp2012 Over a year ago

This was helpful. It seems to be a problem for me in ruby 2.0.0-p247 but not in other rubies or patch versions.

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