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

[David Given <dg@...>]

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.

> 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?

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