Re: Lua / shell - How to "pipe" commands in os.execute() ?

[luc1an0 <luc1an0@...>]

David Given a Ãcrit :
> luc1an0 wrote:
> [...]
>   
> > My question can be very stupid, but I want to execute some shell 
> > commands with a pipe ( | ) like that :
> > os.execute(ps aux | grep my_program) or a generic way :
> > os.execute("my_command" "my_args" | another_command | ....)
> >     
>
> I may be missing something here, but:
>
> os.execute("ps aux | grep my_program")
>
> ...should work.
>   
yes, works great... When i 've tried to do that, i had some bash errors. 
Probably due to an incorrect syntax...
> > And another simply question : How to don't return exit code if function 
> > even return string, for example
> > io.write(os.execute("pwd")) return this
> > /home/fred
> > 0
> >     
>
> I'm not sure what you're asking for here. Do you want to stop pwd printing
> it's output directly to the console and instead let Lua capture it as a
> string? If so, use io.popen:
>
> local f = io.popen("pwd") -- runs command
> local l = f:read("*a") -- read output of command
> print(l)
> f:close()
>
> Or did you mean something else?
>   
Thanks !
"pwd" was just an example... In fact, if I execute command which return 
a status code (like "test"), I want to get it. But if the command return 
a string, I just want to get these string without the status code.

Thanks a lot :)