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David Given a écrit :

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 :)