[erlang-questions] os:cmd/1 does not work for ulimit -n

[Oscar Hellström]

AFAIK, os:cmd/1 will open a port for doing the OS command. This will 
spawn  a new OS process in which you're setting the ulimit. This doesn't 
affect the parent process however. You will need to do this in the shell 
before you start Erlang.

MAthuvathanan Mou. wrote:
> Hi all,
> 
> Using Linux (RedHat) I wanted to increase number of open files for that 
> session only (temporarily)
> 
> In the erl shell I did
> 
> erl
> Erlang (BEAM) emulator version 5.5.5 [source] [async-threads:0] [hipe] 
> [kernel-poll:false]
> 
> Eshell V5.5.5  (abort with ^G)
> 1> os:cmd('ulimit -n').
> "1024\n"
> 2> os:cmd('ulimit -n 2048').
> []
> 3> os:cmd('ulimit -n').    
> "1024\n"
> 4>
> 
> Why did open file not increase here?
> 
> Regards,
> 
> -- 
> Mathuvathanan Mou.
> 
> 
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