# Ir / iirb on Mono

**URL:** <https://www.ruby-forum.com/t/ir-iirb-on-mono/185068>\
**Category:** IronRuby\
**Created:** [March 12, 2010, 10:29pm UTC](https://www.ruby-forum.com/t/ir-iirb-on-mono/185068 "2010-03-12T22:29:41Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![bantic](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/a9adbd/32.png) [@bantic](https://www.ruby-forum.com/u/bantic)\
**Post date:** [March 12, 2010, 10:29pm UTC](https://www.ruby-forum.com/t/ir-iirb-on-mono/185068/1 "2010-03-12T22:29:41Z")

</div>

Hi All,

I’ve noticed problems with iirb and ir interactive mode on my Mac. I’m  
running the 1.0-rc2 build.

With ir, I’ve noticed two things:

1. The up arrow does not scroll through the command history. This works  
on Windows.

2. the first character doesn’t appear, though is processed, for each  
line. For example, if I open a new ir session and type ‘puts “Hello,  
World”’ the console shows:

> > > uts “Hello, World”

but if I hit return, the command is processed just fine. It’s literally  
just the first character - I often end up hitting space then backspace  
or something else before typing and then it is fine.

With iirb, I’m getting an exception just trying to run it:

cory-foys-macbook-pro:~ foyc$ iirb  
IronRuby.Libraries:0:in `GetExecutable': infocmp -C (Errno::ENOENT) from IronRuby.Libraries:0:in `CreateProcess’  
from IronRuby.Libraries:0:in `CreateProcess’  
from :0:in ``’  
[Stack Trace truncated]

Running infocmp -C produces:

ory-foys-macbook-pro:~ foyc$ infocmp -C

# Reconstructed via infocmp from file:

/usr/share/terminfo/78/xterm-color  
xterm-color|nxterm|generic color xterm:  
:am:bs:km:mi:ms:xn:  
:co#80:it#8:li#24:  
:AL=\E[%dL:DC=\E[%dP:DL=\E[%dM:DO=\E[%dB:LE=\E[%dD:  
:RI=\E[%dC:UP=\E[%dA:ae=^O:al=\E[L:as=^N:bl=^G:cd=\E[J:  
:ce=\E[K:cl=\E[H\E[2J:cm=\E[%i%d;%dH:cr=^M:  
:cs=\E[%i%d;%dr:ct=\E[3g:dc=\E[P:dl=\E[M:do=^J:ei=\E[4l:  
:ho=\E[H:im=\E[4h:  
:is=\E7\E[r\E[m\E[?7h\E[?1;3;4;6l\E[4l\E8\E\>:  
:k1=\E[11~:k2=\E[12~:k3=\E[13~:k4=\E[14~:k5=\E[15~:  
:k6=\E[17~:k7=\E[18~:k8=\E[19~:k9=\E[20~:kD=\E[3~:  
:kI=\E[2~:kN=\E[6~:kP=\E[5~:kb=^H:kd=\EOB:ke=\E[?1l\E\>:  
:kl=\EOD:kr=\EOC:ks=\E[?1h\E=:ku=\EOA:le=^H:md=\E[1m:  
:me=\E[m:mr=\E[7m:nd=\E[C:rc=\E8:  
:rs=\E7\E[r\E8\E[m\E[?7h\E[?1;3;4;6l\E[4l\E\>:sc=\E7:  
:se=\E[m:sf=^J:so=\E[7m:sr=\EM:st=\EH:ta=^I:  
:te=\E[2J\E[?47l\E8:ti=\E7\E[?47h:ue=\E[m:up=\E[A:  
:us=\E[4m:

I’m happy to look into both of these, but wanted to see if anyone else  
was seeing this before I did (or was looking at it already).

–  
Cory F.  
[http://www.coryfoy.com](http://www.coryfoy.com)  
[http://twitter.com/cory\_foy](http://twitter.com/cory_foy)

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<div class="post-metadata">

**Author:** ![bantic](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/a9adbd/32.png) [@bantic](https://www.ruby-forum.com/u/bantic)\
**Post date:** [March 12, 2010, 10:41pm UTC](https://www.ruby-forum.com/t/ir-iirb-on-mono/185068/2 "2010-03-12T22:41:23Z")

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The command history on Windows when running ir.exe is being provided by  
the Windows console subsystem; it’s not actually part of IronRuby. I  
imagine that Mono’s readline library could be used to give the same  
effect on non-Windows platforms.