Very Computer

1. Subject: Confusion re. "find -perm ..."

Hello,

I'm running into behaviour which I don't understand using
"find" on solaris 8 (sun box).  I want to find the files and
directories for which "group" and "other" do not have read
permission:

   find .  \! -perm -go+r -exec ls -l {} \;

This turned up files, some of which "group" and "other" have
read permissions to.  This wasn't what I was expecting.  As
a sanity check, I tried the opoosite (finding files for
which "group" and "other" *have* read access):

   find . -perm -go+r -exec ls -l {} \;

This turns up some files for which "group" and "other" do
*not* have read permission e.g.:

   drwx------   2 fma      students     512 Mar  3 06:25 BuildLogs
   -r--------   1 fma      students     407 Apr  5  2002 ChangeLog

Here are the selected man page sentences from which I got my
[mis]understanding of the -perm "primary":

     -perm [-]mode

           The mode argument is used to represent file mode bits.
           <<...SNIP...>>
           To start, a template will be assumed with
           all file mode bits cleared.  An op symbol of:

           +     will set the appropriate mode bits in  the  tem-
                 plate;

           <<...SNIP...>>
           if mode is prefixed by a hyphen,  the  pri-
           mary will evaluate as true if at least all the bits in
           the resulting template are set in the file  permission
           bits.

Could someone more experienced than I please point out how
my "find" expression departs from the man page in finding
files for which "group" and "other" do (or do not) have read
permission?  Thanks.

Fred
--
Fred Ma
Dept. of Electronics, Carleton University
1125 Colonel By Drive, Ottawa, Ontario
Canada, K1S 5B6

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