Ruby on Rails

what does

ruby -e "system 'which echo'"

tell you?


/Walther

> Den 8. mar. 2016 kl. 16.48 skrev Colin Law <clanlaw@gmail.com>:
>
> Can anyone explain this?
>
> If in a terminal I run echo -e 'hello' I see, as one would expect,
> $ echo -e 'hello'
> hello
>
> However if I execute the command using irb I see
> $ irb
> 2.1.3 :001 > system "echo -e 'hello'"
> -e hello
> => true
>
> It echoes the option which suggests to me that echo does not recognise -e
> If however I do
> 2.1.3 :003 > system "/bin/echo -e 'hello'"
> hello
> => true
>
> Which implies that when I do not specify the path it is using a
> different version of echo.
>
> I also see
> 2.1.3 :005 > system "which echo"
> /bin/echo
> => true
>
> But I am not sure that is relevant. Google has not helped me in this matter.
>
> This is using gnome-terminal in Ubuntu 16.04 (and 14.04)
>
> Any suggestions anyone?
>
> Colin
>
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