How to suppress the output of return value in IRB/Rails Console?

Question

An example is if I go into IRB and do the following:

jruby-1.6.7 :026 > puts [1,2,3,4,5]
1
2
3
4
5
=> nil

Is there anyway to suppress the nil? The problem is if I put in a large data structure, it spams something an other irrelevant return respond. I'm more interested in seeing output from debug statements I run through a block and have to continually scroll up and look for the real data.

Perhaps try this: http://austinruby.com/2006/10/6/quieting-irb-s-return-value — Tallboy, Apr 14 '12 at 02:34
From the solutions below `irb --simple-prompt --noecho` is certainly your best and simplest bet. — Alexander Swann, Apr 04 '16 at 14:14
Possible duplicate of [How to suppress Rails console/irb outputs](http://stackoverflow.com/questions/4678732/how-to-suppress-rails-console-irb-outputs) — Franklin Yu, Nov 15 '16 at 19:52

score 63 · Accepted Answer · edited Dec 25 '22 at 01:33

If you just want to suppress long output once in a while, use ;0, like:

a = [*1..10000];0
# => 0

If you want to suppress it generally, use the ~/.irbrc file. The IRB.conf[:INSPECT_MODE] and IRB.conf[:PROMPT][your_prompt][:RETURN] control what is returned. You can figure out what your_prompt is by checking IRB.conf[:PROMPT_MODE]

Example:

IRB.conf[:PROMPT][:DEFAULT][:RETURN] = "" # suppress return value completely

You'll need to restart irb after changing the value.

score 18 · Answer 2 · answered Feb 15 '13 at 22:04

You can also supress the output with the following command as irb --simple-prompt --noecho.

Find the below:

@ubuntu:~$ irb --simple-prompt
>> puts "hi"
hi
=> nil
>> p "hi"
"hi"
=> "hi"
>> exit
@ubuntu:~$ irb --simple-prompt --noecho
>> puts "hi"
hi
>> p "hi"
"hi"
>>

Hope you will be fine with it.

I am using ruby version as below :

@ubuntu:~$ ruby -v
ruby 1.9.3p194 (2012-04-20 revision 35410) [x86_64-linux]

score 7 · Answer 3 · answered Mar 26 '15 at 09:43

7

From @Tallboy dead link

To suppress the return value in Rails console, enter
conf.return_format = ""

Default (Print the return value)
conf.return_format = "=> %s\n"

answered Mar 26 '15 at 09:43

Ivan Chau

1,403
1
18
28

score 6 · Answer 4 · answered Oct 17 '18 at 21:54

6

i run the following in irb:

irb_context.echo = false

e.g.

$ irb
> "foo"
=> "foo"
> irb_context.echo = false
> "foo"
>

answered Oct 17 '18 at 21:54

schpet

9,664
6
32
35

Note that this can also be easily turned back on, e.g. `irb_context.echo = false; "foo"; irb_context.echo = true`, which can be handy for disabling return values only on certain code sections. – Todd A. Jacobs Feb 11 '21 at 22:56

How to suppress the output of return value in IRB/Rails Console?

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