Hide the output of a command using Ruby 2.6

Question

I am not sure this is a bug or a new feature of Ruby 2.6, but since performing the upgrade 2.3 --> 2.6, my IRB terminal does not behave as usual and cannot hide outputs anymore. Previously when I typed a semicolon, it would wait until receiving the next instruction without semicolon to run all the code and hide values with semicolons

2.6.3 :008 > 1 + 1
 => 2
2.6.3 :009 > 1 + 1;
 => 2 
2.6.3 :010 > (1 + 1);
 => 2
2.6.3 :011 > very_large_inspect_result;
 => [console keeps printing for ages)

Using ruby-2.6.3 [ x86_64 ] and the IRB terminal from rails-5.1.6

What can I do to hide the output from commands ? The goal is to avoid printing huge strings of inspect when returning a very large collection

EDIT : I could systematically add a 0 or something after the semicolons, but it feels cheap

2.6.3 :010 > (1 + 1); 0
 => 0

EDIT2 : what happened previously in Ruby 2.3.x :

irb(main):001:0> puts 1;
irb(main):002:0* puts 2;
irb(main):003:0* puts 3
1
2
3
=> nil

Pry suppresses output when adding a ; and generally offers some nice additions over irb. — Michael Kohl
– Michael Kohl, Commented Aug 28, 2019 at 13:23
You could also do this out = $stdout and $stdout = File.open(File::NULL,'w') then when you are done just set $stdout = out to reset the output stream. This is essentially like piping to "/dev/null" — engineersmnky
– engineersmnky, Commented Aug 28, 2019 at 14:12

Girish Bhanarkar · Accepted Answer · 2019-08-28 12:59:55Z

4

Run the below command in IRB terminal.

irb_context.echo = false

answered Aug 28, 2019 at 12:59

Girish Bhanarkar

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3 Comments

ray Over a year ago

This will be applied for all possibilities

Girish Bhanarkar Over a year ago

Not sure but I think it will.

Cyril Duchon-Doris Over a year ago

this does not work ? I have edited my question to give an example of what happened in RUby 2.3 before I upgraded to Ruby 2.6

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