[erlang-questions] Best way to check if a given directory is empty (or not)?

Zabrane Mickael <>
Tue Mar 13 19:05:57 CET 2012


Great Taavi. That's the solution I'll use from now (until a better one will be suggested).
Thanks to all of you guys !!!

Regards,
Zabrane

On Mar 13, 2012, at 5:01 PM, Taavi Talvik wrote:

> On Mar 13, 2012, at 5:18 PM, Wes James wrote:
> 
>> On Tue, Mar 13, 2012 at 12:09 AM, Zabrane Mickael <> wrote:
>>> Hi guys,
>>> 
>>> I'd like to know if there's a good and portable method to check if a directory is empty (or not)?
>>> In my case, the directory can contains huge number (more than 150K in average) of files if it is not empty.
> 
> 
> On unix systems link_count=2 means, that directory is empty:
> 
> 3> rr("/usr/local/lib/erlang/lib/kernel-2.14.1/include/file.hrl").
> [file_descriptor,file_info]
> 4> file:read_file_info(".").                                      
> {ok,#file_info{size = 170,type = directory,
>               access = read_write,
>               atime = {{2012,3,13},{17,57,1}},
>               mtime = {{2007,9,30},{14,7,32}},
>               ctime = {{2012,3,11},{3,6,39}},
>               mode = 16877,links = 5,major_device = 234881026,
>               minor_device = 0,inode = 43374422,uid = 501,gid = 501}}
> 
> 2> file:read_file_info("empty").                                  
> {ok,#file_info{size = 68,type = directory,
>               access = read_write,
>               atime = {{2012,3,13},{17,59,44}},
>               mtime = {{2012,3,13},{17,59,44}},
>               ctime = {{2012,3,13},{17,59,44}},
>               mode = 16877,links = 2,major_device = 234881026,
>               minor_device = 0,inode = 43401684,uid = 501,gid = 501}}
> 
> best regards,
> taavi
> --
> "We should forget about small efficiencies, about 97 percent of the time. 
> Premature optimization is the root of all evil." Donald Knuth
> 
> Taavi Talvik
> 
> +372 5656 9996
> 






More information about the erlang-questions mailing list