What command to see which file is opened by a program during execution?

[Paul Howarth]

VJ wrote:
> Hi,
>    I forgot this command which could be used to see what files are
> accessed by a program during it's execution time, the syntax was like
> following
> 
> command_i_forgot program_i_want_to_monitor
> 
> and it used to print all files/shared libraries a program used to load
> while program was running.
> 
> Can anybody tell what command is that?

strace

Paul.