eval in bash

hi everyone
i've been reading learning the bash and there is somrthing i don;t
understand what does eval do

i know that it run a command or script twice but i don;t see in
what for cases i can use this

could somebody explain this to me

Search our shell forum for eval, you will find lots of hits. Each one is an example. This is one example.

i will try your advice

and thx for your reply

Just replied to a wrong thread.