Command Line Interface Ruby

Question

Say I have the code:

print(">>> ")
command = gets

What I want to do, is execute the command variable as one would normally do in Ruby, by putting backticks around the code you want to execute. How would I do this? If I do:

`command`

it just tries to execute the word command. How do I execute the variable???

Be very careful doing this. Allowing a user to enter a command, then executing it for them, allows them to execute the command with the permissions your code runs under. If it runs as root, and the user enters "rm -rf /", your system will go bye-bye really fast. — the Tin Man
– the Tin Man, Commented Apr 3, 2012 at 21:55
yep i know! I'm obviously not gonna release this to other people, I just got the idea from the book Metaprogramming Ruby. About a page after, it told me how bad of an idea it was haha — Billjk
– Billjk, Commented Apr 4, 2012 at 1:33

Andrew Marshall · Accepted Answer · 2012-04-03 20:13:12Z

5

Just interpolate it like you would with a string:

`#{command}`

answered Apr 3, 2012 at 20:13

Andrew Marshall

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1 Comment

steenslag Over a year ago

+1 You can guess things like this in Ruby and surprisingly often it just works.

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